/MDXParameter/MDXParameter/SqlHelper.cs

// ===============================================================================

// Microsoft Data Access Application Block for .NET

// http://msdn.microsoft.com/library/en-us/dnbda/html/daab-rm.asp

//

// SQLHelper.cs

//

// This file contains the implementations of the SqlHelper and SqlHelperParameterCache

// classes.

//

// For more information see the Data Access Application Block Implementation Overview. 

// ===============================================================================

// Release history

// VERSION	DESCRIPTION

//   2.0	Added support for FillDataset, UpdateDataset and "Param" helper methods

//

// ===============================================================================

// Copyright (C) 2000-2001 Microsoft Corporation

// All rights reserved.

// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY

// OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT

// LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR

// FITNESS FOR A PARTICULAR PURPOSE.

// ==============================================================================



using System;

using System.Data;

using System.Xml;

using System.Data.SqlClient;

using System.Collections;



namespace Microsoft.ApplicationBlocks.Data

{

    /// <summary>

    /// The SqlHelper class is intended to encapsulate high performance, scalable best practices for 

    /// common uses of SqlClient

    /// </summary>

    internal sealed class SqlHelper

    {

        #region private utility methods & constructors



        // Since this class provides only static methods, make the default constructor private to prevent 

        // instances from being created with "new SqlHelper()"

        private SqlHelper() { }



        /// <summary>

        /// This method is used to attach array of SqlParameters to a SqlCommand.

        /// 

        /// This method will assign a value of DbNull to any parameter with a direction of

        /// InputOutput and a value of null.  

        /// 

        /// This behavior will prevent default values from being used, but

        /// this will be the less common case than an intended pure output parameter (derived as InputOutput)

        /// where the user provided no input value.

        /// </summary>

        /// <param name="command">The command to which the parameters will be added</param>

        /// <param name="commandParameters">An array of SqlParameters to be added to command</param>

        private static void AttachParameters(SqlCommand command, SqlParameter[] commandParameters)

        {

            if (command == null) throw new ArgumentNullException("command");

            if (commandParameters != null)

            {

                foreach (SqlParameter p in commandParameters)

                {

                    if (p != null)

                    {

                        // Check for derived output value with no value assigned

                        if ((p.Direction == ParameterDirection.InputOutput ||

                            p.Direction == ParameterDirection.Input) &&

                            (p.Value == null))

                        {

                            p.Value = DBNull.Value;

                        }

                        command.Parameters.Add(p);

                    }

                }

            }

        }



        /// <summary>

        /// This method assigns dataRow column values to an array of SqlParameters

        /// </summary>

        /// <param name="commandParameters">Array of SqlParameters to be assigned values</param>

        /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values</param>

        private static void AssignParameterValues(SqlParameter[] commandParameters, DataRow dataRow)

        {

            if ((commandParameters == null) || (dataRow == null))

            {

                // Do nothing if we get no data

                return;

            }



            int i = 0;

            // Set the parameters values

            foreach (SqlParameter commandParameter in commandParameters)

            {

                // Check the parameter name

                if (commandParameter.ParameterName == null ||

                    commandParameter.ParameterName.Length <= 1)

                    throw new Exception(

                        string.Format(

                            "Please provide a valid parameter name on the parameter #{0}, the ParameterName property has the following value: '{1}'.",

                            i, commandParameter.ParameterName));

                if (dataRow.Table.Columns.IndexOf(commandParameter.ParameterName.Substring(1)) != -1)

                    commandParameter.Value = dataRow[commandParameter.ParameterName.Substring(1)];

                i++;

            }

        }



        /// <summary>

        /// This method assigns an array of values to an array of SqlParameters

        /// </summary>

        /// <param name="commandParameters">Array of SqlParameters to be assigned values</param>

        /// <param name="parameterValues">Array of objects holding the values to be assigned</param>

        private static void AssignParameterValues(SqlParameter[] commandParameters, object[] parameterValues)

        {

            if ((commandParameters == null) || (parameterValues == null))

            {

                // Do nothing if we get no data

                return;

            }



            // We must have the same number of values as we pave parameters to put them in

            if (commandParameters.Length != parameterValues.Length)

            {

                throw new ArgumentException("Parameter count does not match Parameter Value count.");

            }



            // Iterate through the SqlParameters, assigning the values from the corresponding position in the 

            // value array

            for (int i = 0, j = commandParameters.Length; i < j; i++)

            {

                // If the current array value derives from IDbDataParameter, then assign its Value property

                if (parameterValues[i] is IDbDataParameter)

                {

                    IDbDataParameter paramInstance = (IDbDataParameter)parameterValues[i];

                    if (paramInstance.Value == null)

                    {

                        commandParameters[i].Value = DBNull.Value;

                    }

                    else

                    {

                        commandParameters[i].Value = paramInstance.Value;

                    }

                }

                else if (parameterValues[i] == null)

                {

                    commandParameters[i].Value = DBNull.Value;

                }

                else

                {

                    commandParameters[i].Value = parameterValues[i];

                }

            }

        }







































        /// <summary>

        /// This method assigns an array of values to an array of SqlParameters

        /// </summary>

        /// <param name="commandParameters">Array of SqlParameters to be assigned values</param>

        /// <param name="parameterValues">Array of objects holding the values to be assigned</param>

        private static void UpdateParameterValues(SqlParameter[] commandParameters, object[] parameterValues)

        {

            if ((commandParameters == null) || (parameterValues == null))

            {

                // Do nothing if we get no data

                return;

            }



            // We must have the same number of values as we pave parameters to put them in

            if (commandParameters.Length != parameterValues.Length)

            {

                throw new ArgumentException("Parameter count does not match Parameter Value count.");

            }



            // Iterate through the SqlParameters, assigning the values from the corresponding position in the 

            // value array

            for (int i = 0, j = commandParameters.Length; i < j; i++)

            {

                //Update the Return Value

                if (commandParameters[i].Direction == ParameterDirection.ReturnValue)

                {

                    parameterValues[i] = commandParameters[i].Value;

                }



                 if (commandParameters[i].Direction == ParameterDirection.InputOutput)

                     parameterValues[i] = commandParameters[i].Value;

                 }

        }











        /// <summary>

        /// This method opens (if necessary) and assigns a connection, transaction, command type and parameters 

        /// to the provided command

        /// </summary>

        /// <param name="command">The SqlCommand to be prepared</param>

        /// <param name="connection">A valid SqlConnection, on which to execute this command</param>

        /// <param name="transaction">A valid SqlTransaction, or 'null'</param>

        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>

        /// <param name="commandText">The stored procedure name or T-SQL command</param>

        /// <param name="commandParameters">An array of SqlParameters to be associated with the command or 'null' if no parameters are required</param>

        /// <param name="mustCloseConnection"><c>true</c> if the connection was opened by the method, otherwose is false.</param>

        private static void PrepareCommand(SqlCommand command, SqlConnection connection, SqlTransaction transaction, CommandType commandType, string commandText, SqlParameter[] commandParameters, out bool mustCloseConnection)

        {

            if (command == null) throw new ArgumentNullException("command");

            if (commandText == null || commandText.Length == 0) throw new ArgumentNullException("commandText");



            // If the provided connection is not open, we will open it

            if (connection.State != ConnectionState.Open)

            {

                mustCloseConnection = true;

                connection.Open();

            }

            else

            {

                mustCloseConnection = false;

            }



            // Associate the connection with the command

            command.Connection = connection;



            // Set the command text (stored procedure name or SQL statement)

            command.CommandText = commandText;



            // If we were provided a transaction, assign it

            if (transaction != null)

            {

                if (transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");

                command.Transaction = transaction;

            }



            // Set the command type

            command.CommandType = commandType;



            // Attach the command parameters if they are provided

            if (commandParameters != null)

            {

                AttachParameters(command, commandParameters);

            }

            return;

        }



        #endregion private utility methods & constructors



        #region ExecuteNonQuery



        /// <summary>

        /// Execute a SqlCommand (that returns no resultset and takes no parameters) against the database specified in 

        /// the connection string

        /// </summary>

        /// <remarks>

        /// e.g.:  

        ///  int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders");

        /// </remarks>

        /// <param name="connectionString">A valid connection string for a SqlConnection</param>

        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>

        /// <param name="commandText">The stored procedure name or T-SQL command</param>

        /// <returns>An int representing the number of rows affected by the command</returns>

        internal static int ExecuteNonQuery(string connectionString, CommandType commandType, string commandText)

        {

            // Pass through the call providing null for the set of SqlParameters

            return ExecuteNonQuery(connectionString, commandType, commandText, (SqlParameter[])null);

        }



        /// <summary>

        /// Execute a SqlCommand (that returns no resultset) against the database specified in the connection string 

        /// using the provided parameters

        /// </summary>

        /// <remarks>

        /// e.g.:  

        ///  int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));

        /// </remarks>

        /// <param name="connectionString">A valid connection string for a SqlConnection</param>

        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>

        /// <param name="commandText">The stored procedure name or T-SQL command</param>

        /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>

        /// <returns>An int representing the number of rows affected by the command</returns>

        internal static int ExecuteNonQuery(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)

        {

            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");



            // Create & open a SqlConnection, and dispose of it after we are done

            using (SqlConnection connection = new SqlConnection(connectionString))

            {

                connection.Open();



                // Call the overload that takes a connection in place of the connection string

                return ExecuteNonQuery(connection, commandType, commandText, commandParameters);

            }

        }



        

        

        

        

        

        

        

        /// <summary>

        /// Execute a stored procedure via a SqlCommand (that returns no resultset) against the database specified in 

        /// the connection string using the provided parameter values.  This method will query the database to discover the parameters for the 

        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.

        /// </summary>

        /// <remarks>

        /// This method provides no access to output parameters or the stored procedure's return value parameter.

        /// 

        /// e.g.:  

        ///  int result = ExecuteNonQuery(connString, "PublishOrders", 24, 36);

        /// </remarks>

        /// <param name="connectionString">A valid connection string for a SqlConnection</param>

        /// <param name="spName">The name of the stored prcedure</param>

        /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>

        /// <returns>An int representing the number of rows affected by the command</returns>

        internal static int ExecuteNonQuery(string connectionString, string spName, params object[] parameterValues)

        {

            int intReturn;

            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");

            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");



            // If we receive parameter values, we need to figure out where they go

            if ((parameterValues != null) && (parameterValues.Length > 0))

            {

                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)

                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName,true);



                // Assign the provided values to these parameters based on parameter order

                AssignParameterValues(commandParameters, parameterValues);



                // Call the overload that takes an array of SqlParameters

                //return ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName, commandParameters);

                intReturn = ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName, commandParameters);



                //Update the array -  parameterValues from the new CommandParameters that should have the ReturnValue

                UpdateParameterValues(commandParameters, parameterValues);

                return intReturn;

            }

            else

            {

                // Otherwise we can just call the SP without params

                return ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName);

            }

        }



        /// <summary>

        /// Execute a SqlCommand (that returns no resultset and takes no parameters) against the provided SqlConnection. 

        /// </summary>

        /// <remarks>

        /// e.g.:  

        ///  int result = ExecuteNonQuery(conn, CommandType.StoredProcedure, "PublishOrders");

        /// </remarks>

        /// <param name="connection">A valid SqlConnection</param>

        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>

        /// <param name="commandText">The stored procedure name or T-SQL command</param>

        /// <returns>An int representing the number of rows affected by the command</returns>

        internal static int ExecuteNonQuery(SqlConnection connection, CommandType commandType, string commandText)

        {

            // Pass through the call providing null for the set of SqlParameters

            return ExecuteNonQuery(connection, commandType, commandText, (SqlParameter[])null);

        }



        /// <summary>

        /// Execute a SqlCommand (that returns no resultset) against the specified SqlConnection 

        /// using the provided parameters.

        /// </summary>

        /// <remarks>

        /// e.g.:  

        ///  int result = ExecuteNonQuery(conn, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));

        /// </remarks>

        /// <param name="connection">A valid SqlConnection</param>

        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>

        /// <param name="commandText">The stored procedure name or T-SQL command</param>

        /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>

        /// <returns>An int representing the number of rows affected by the command</returns>

        internal static int ExecuteNonQuery(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)

        {

            if (connection == null) throw new ArgumentNullException("connection");



            // Create a command and prepare it for execution

            SqlCommand cmd = new SqlCommand();

            bool mustCloseConnection = false;

            PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection);



            // Finally, execute the command

            int retval = cmd.ExecuteNonQuery();



            // Detach the SqlParameters from the command object, so they can be used again

            cmd.Parameters.Clear();

            if (mustCloseConnection)

                connection.Close();

            return retval;

        }



        /// <summary>

        /// Execute a stored procedure via a SqlCommand (that returns no resultset) against the specified SqlConnection 

        /// using the provided parameter values.  This method will query the database to discover the parameters for the 

        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.

        /// </summary>

        /// <remarks>

        /// This method provides no access to output parameters or the stored procedure's return value parameter.

        /// 

        /// e.g.:  

        ///  int result = ExecuteNonQuery(conn, "PublishOrders", 24, 36);

        /// </remarks>

        /// <param name="connection">A valid SqlConnection</param>

        /// <param name="spName">The name of the stored procedure</param>

        /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>

        /// <returns>An int representing the number of rows affected by the command</returns>

        internal static int ExecuteNonQuery(SqlConnection connection, string spName, params object[] parameterValues)

        {

            if (connection == null) throw new ArgumentNullException("connection");

            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");



            // If we receive parameter values, we need to figure out where they go

            if ((parameterValues != null) && (parameterValues.Length > 0))

            {

                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)

                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);



                // Assign the provided values to these parameters based on parameter order

                AssignParameterValues(commandParameters, parameterValues);



                // Call the overload that takes an array of SqlParameters

                return ExecuteNonQuery(connection, CommandType.StoredProcedure, spName, commandParameters);

            }

            else

            {

                // Otherwise we can just call the SP without params

                return ExecuteNonQuery(connection, CommandType.StoredProcedure, spName);

            }

        }



        /// <summary>

        /// Execute a SqlCommand (that returns no resultset and takes no parameters) against the provided SqlTransaction. 

        /// </summary>

        /// <remarks>

        /// e.g.:  

        ///  int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "PublishOrders");

        /// </remarks>

        /// <param name="transaction">A valid SqlTransaction</param>

        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>

        /// <param name="commandText">The stored procedure name or T-SQL command</param>

        /// <returns>An int representing the number of rows affected by the command</returns>

        internal static int ExecuteNonQuery(SqlTransaction transaction, CommandType commandType, string commandText)

        {

            // Pass through the call providing null for the set of SqlParameters

            return ExecuteNonQuery(transaction, commandType, commandText, (SqlParameter[])null);

        }



        /// <summary>

        /// Execute a SqlCommand (that returns no resultset) against the specified SqlTransaction

        /// using the provided parameters.

        /// </summary>

        /// <remarks>

        /// e.g.:  

        ///  int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));

        /// </remarks>

        /// <param name="transaction">A valid SqlTransaction</param>

        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>

        /// <param name="commandText">The stored procedure name or T-SQL command</param>

        /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>

        /// <returns>An int representing the number of rows affected by the command</returns>

        internal static int ExecuteNonQuery(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)

        {

            if (transaction == null) throw new ArgumentNullException("transaction");

            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");



            // Create a command and prepare it for execution

            SqlCommand cmd = new SqlCommand();

            bool mustCloseConnection = false;

            PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);



            // Finally, execute the command

            int retval = cmd.ExecuteNonQuery();



            // Detach the SqlParameters from the command object, so they can be used again

            cmd.Parameters.Clear();

            return retval;

        }



        /// <summary>

        /// Execute a stored procedure via a SqlCommand (that returns no resultset) against the specified 

        /// SqlTransaction using the provided parameter values.  This method will query the database to discover the parameters for the 

        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.

        /// </summary>

        /// <remarks>

        /// This method provides no access to output parameters or the stored procedure's return value parameter.

        /// 

        /// e.g.:  

        ///  int result = ExecuteNonQuery(conn, trans, "PublishOrders", 24, 36);

        /// </remarks>

        /// <param name="transaction">A valid SqlTransaction</param>

        /// <param name="spName">The name of the stored procedure</param>

        /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>

        /// <returns>An int representing the number of rows affected by the command</returns>

        internal static int ExecuteNonQuery(SqlTransaction transaction, string spName, params object[] parameterValues)

        {

            if (transaction == null) throw new ArgumentNullException("transaction");

            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");

            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");



            // If we receive parameter values, we need to figure out where they go

            if ((parameterValues != null) && (parameterValues.Length > 0))

            {

                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)

                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);



                // Assign the provided values to these parameters based on parameter order

                AssignParameterValues(commandParameters, parameterValues);



                // Call the overload that takes an array of SqlParameters

                return ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName, commandParameters);

            }

            else

            {

                // Otherwise we can just call the SP without params

                return ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName);

            }

        }



        #endregion ExecuteNonQuery



        #region ExecuteDataset



        /// <summary>

        /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the database specified in 

        /// the connection string. 

        /// </summary>

        /// <remarks>

        /// e.g.:  

        ///  DataSet ds = ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders");

        /// </remarks>

        /// <param name="connectionString">A valid connection string for a SqlConnection</param>

        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>

        /// <param name="commandText">The stored procedure name or T-SQL command</param>

        /// <returns>A dataset containing the resultset generated by the command</returns>

        internal static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText)

        {

            // Pass through the call providing null for the set of SqlParameters

            return ExecuteDataset(connectionString, commandType, commandText, (SqlParameter[])null);

        }



        /// <summary>

        /// Execute a SqlCommand (that returns a resultset) against the database specified in the connection string 

        /// using the provided parameters.

        /// </summary>

        /// <remarks>

        /// e.g.:  

        ///  DataSet ds = ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));

        /// </remarks>

        /// <param name="connectionString">A valid connection string for a SqlConnection</param>

        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>

        /// <param name="commandText">The stored procedure name or T-SQL command</param>

        /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>

        /// <returns>A dataset containing the resultset generated by the command</returns>

        internal static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)

        {

            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");



            // Create & open a SqlConnection, and dispose of it after we are done

            using (SqlConnection connection = new SqlConnection(connectionString))

            {

                connection.Open();



                // Call the overload that takes a connection in place of the connection string

                return ExecuteDataset(connection, commandType, commandText, commandParameters);

            }

        }



        /// <summary>

        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the database specified in 

        /// the connection string using the provided parameter values.  This method will query the database to discover the parameters for the 

        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.

        /// </summary>

        /// <remarks>

        /// This method provides no access to output parameters or the stored procedure's return value parameter.

        /// 

        /// e.g.:  

        ///  DataSet ds = ExecuteDataset(connString, "GetOrders", 24, 36);

        /// </remarks>

        /// <param name="connectionString">A valid connection string for a SqlConnection</param>

        /// <param name="spName">The name of the stored procedure</param>

        /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>

        /// <returns>A dataset containing the resultset generated by the command</returns>

        internal static DataSet ExecuteDataset(string connectionString, string spName, params object[] parameterValues)

        {

            DataSet dsReturn;

            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");

            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");



            // If we receive parameter values, we need to figure out where they go

            if ((parameterValues != null) && (parameterValues.Length > 0))

            {

                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)

                //SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName); -- Original code from sqlHelper

                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName,true ); // Added Parameter true to support ReturnValues



                // Assign the provided values to these parameters based on parameter order

                AssignParameterValues(commandParameters, parameterValues);



                // Call the overload that takes an array of SqlParameters

                //return ExecuteDataset(connectionString, CommandType.StoredProcedure, spName, commandParameters);

                //Modify code - just store the dataset to dsReturn

                dsReturn = ExecuteDataset(connectionString, CommandType.StoredProcedure, spName, commandParameters);



                //Update the array -  parameterValues from the new CommandParameters that should have the ReturnValue

                UpdateParameterValues(commandParameters, parameterValues);

            }

            else

            {

                // Otherwise we can just call the SP without params

                //return ExecuteDataset(connectionString, CommandType.StoredProcedure, spName);

                //Modify code

                dsReturn = ExecuteDataset(connectionString, CommandType.StoredProcedure, spName);

            }

            //Modify code

            return dsReturn;

        }



        /// <summary>

        /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlConnection. 

        /// </summary>

        /// <remarks>

        /// e.g.:  

        ///  DataSet ds = ExecuteDataset(conn, CommandType.StoredProcedure, "GetOrders");

        /// </remarks>

        /// <param name="connection">A valid SqlConnection</param>

        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>

        /// <param name="commandText">The stored procedure name or T-SQL command</param>

        /// <returns>A dataset containing the resultset generated by the command</returns>

        internal static DataSet ExecuteDataset(SqlConnection connection, CommandType commandType, string commandText)

        {

            // Pass through the call providing null for the set of SqlParameters

            return ExecuteDataset(connection, commandType, commandText, (SqlParameter[])null);

        }



        /// <summary>

        /// Execute a SqlCommand (that returns a resultset) against the specified SqlConnection 

        /// using the provided parameters.

        /// </summary>

        /// <remarks>

        /// e.g.:  

        ///  DataSet ds = ExecuteDataset(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));

        /// </remarks>

        /// <param name="connection">A valid SqlConnection</param>

        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>

        /// <param name="commandText">The stored procedure name or T-SQL command</param>

        /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>

        /// <returns>A dataset containing the resultset generated by the command</returns>

        internal static DataSet ExecuteDataset(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)

        {

            if (connection == null) throw new ArgumentNullException("connection");



            // Create a command and prepare it for execution

            SqlCommand cmd = new SqlCommand();

            bool mustCloseConnection = false;

            PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection);



            // Create the DataAdapter & DataSet

            using (SqlDataAdapter da = new SqlDataAdapter(cmd))

            {

                DataSet ds = new DataSet();



                // Fill the DataSet using default values for DataTable names, etc

                da.Fill(ds);



                // Detach the SqlParameters from the command object, so they can be used again

                cmd.Parameters.Clear();



                if (mustCloseConnection)

                    connection.Close();



                // Return the dataset

                return ds;

            }

        }



        /// <summary>

        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection 

        /// using the provided parameter values.  This method will query the database to discover the parameters for the 

        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.

        /// </summary>

        /// <remarks>

        /// This method provides no access to output parameters or the stored procedure's return value parameter.

        /// 

        /// e.g.:  

        ///  DataSet ds = ExecuteDataset(conn, "GetOrders", 24, 36);

        /// </remarks>

        /// <param name="connection">A valid SqlConnection</param>

        /// <param name="spName">The name of the stored procedure</param>

        /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>

        /// <returns>A dataset containing the resultset generated by the command</returns>

        internal static DataSet ExecuteDataset(SqlConnection connection, string spName, params object[] parameterValues)

        {

            if (connection == null) throw new ArgumentNullException("connection");

            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");



            // If we receive parameter values, we need to figure out where they go

            if ((parameterValues != null) && (parameterValues.Length > 0))

            {

                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)

                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);



                // Assign the provided values to these parameters based on parameter order

                AssignParameterValues(commandParameters, parameterValues);



                // Call the overload that takes an array of SqlParameters

                return ExecuteDataset(connection, CommandType.StoredProcedure, spName, commandParameters);

            }

            else

            {

                // Otherwise we can just call the SP without params

                return ExecuteDataset(connection, CommandType.StoredProcedure, spName);

            }

        }



        /// <summary>

        /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlTransaction. 

        /// </summary>

        /// <remarks>

        /// e.g.:  

        ///  DataSet ds = ExecuteDataset(trans, CommandType.StoredProcedure, "GetOrders");

        /// </remarks>

        /// <param name="transaction">A valid SqlTransaction</param>

        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>

        /// <param name="commandText">The stored procedure name or T-SQL command</param>

        /// <returns>A dataset containing the resultset generated by the command</returns>

        internal static DataSet ExecuteDataset(SqlTransaction transaction, CommandType commandType, string commandText)

        {

            // Pass through the call providing null for the set of SqlParameters

            return ExecuteDataset(transaction, commandType, commandText, (SqlParameter[])null);

        }



        /// <summary>

        /// Execute a SqlCommand (that returns a resultset) against the specified SqlTransaction

        /// using the provided parameters.

        /// </summary>

        /// <remarks>

        /// e.g.:  

        ///  DataSet ds = ExecuteDataset(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));

        /// </remarks>

        /// <param name="transaction">A valid SqlTransaction</param>

        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>

        /// <param name="commandText">The stored procedure name or T-SQL command</param>

        /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>

        /// <returns>A dataset containing the resultset generated by the command</returns>

        internal static DataSet ExecuteDataset(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)

        {

            if (transaction == null) throw new ArgumentNullException("transaction");

            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");



            // Create a command and prepare it for execution

            SqlCommand cmd = new SqlCommand();

            bool mustCloseConnection = false;

            PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);



            // Create the DataAdapter & DataSet

            using (SqlDataAdapter da = new SqlDataAdapter(cmd))

            {

                DataSet ds = new DataSet();



                // Fill the DataSet using default values for DataTable names, etc

                da.Fill(ds);



                // Detach the SqlParameters from the command object, so they can be used again

                cmd.Parameters.Clear();



                // Return the dataset

                return ds;

            }

        }



        /// <summary>

        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified 

        /// SqlTransaction using the provided parameter values.  This method will query the database to discover the parameters for the 

        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.

        /// </summary>

        /// <remarks>

        /// This method provides no access to output parameters or the stored procedure's return value parameter.

        /// 

        /// e.g.:  

        ///  DataSet ds = ExecuteDataset(trans, "GetOrders", 24, 36);

        /// </remarks>

        /// <param name="transaction">A valid SqlTransaction</param>

        /// <param name="spName">The name of the stored procedure</param>

        /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>

        /// <returns>A dataset containing the resultset generated by the command</returns>

        internal static DataSet ExecuteDataset(SqlTransaction transaction, string spName, params object[] parameterValues)

        {

            if (transaction == null) throw new ArgumentNullException("transaction");

            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");

            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");



            // If we receive parameter values, we need to figure out where they go

            if ((parameterValues != null) && (parameterValues.Length > 0))

            {

                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)

                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);



                // Assign the provided values to these parameters based on parameter order

                AssignParameterValues(commandParameters, parameterValues);



                // Call the overload that takes an array of SqlParameters

                return ExecuteDataset(transaction, CommandType.StoredProcedure, spName, commandParameters);

            }

            else

            {

                // Otherwise we can just call the SP without params

                return ExecuteDataset(transaction, CommandType.StoredProcedure, spName);

            }

        }



        #endregion ExecuteDataset



        #region ExecuteReader



        /// <summary>

        /// This enum is used to indicate whether the connection was provided by the caller, or created by SqlHelper, so that

        /// we can set the appropriate CommandBehavior when calling ExecuteReader()

        /// </summary>

        private enum SqlConnectionOwnership

        {

            /// <summary>Connection is owned and managed by SqlHelper</summary>

            Internal,

            /// <summary>Connection is owned and managed by the caller</summary>

            External

        }



        /// <summary>

        /// Create and prepare a SqlCommand, and call ExecuteReader with the appropriate CommandBehavior.

        /// </summary>

        /// <remarks>

        /// If we created and opened the connection, we want the connection to be closed when the DataReader is closed.

        /// 

        /// If the caller provided the connection, we want to leave it to them to manage.

        /// </remarks>

        /// <param name="connection">A valid SqlConnection, on which to execute this command</param>

        /// <param name="transaction">A valid SqlTransaction, or 'null'</param>

        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>

        /// <param name="commandText">The stored procedure name or T-SQL command</param>

        /// <param name="commandParameters">An array of SqlParameters to be associated with the command or 'null' if no parameters are required</param>

        /// <param name="connectionOwnership">Indicates whether the connection parameter was provided by the caller, or created by SqlHelper</param>

        /// <returns>SqlDataReader containing the results of the command</returns>

        private static SqlDataReader ExecuteReader(SqlConnection connection, SqlTransaction transaction, CommandType commandType, string commandText, SqlParameter[] commandParameters, SqlConnectionOwnership connectionOwnership)

        {

            if (connection == null) throw new ArgumentNullException("connection");



            bool mustCloseConnection = false;

            // Create a command and prepare it for execution

            SqlCommand cmd = new SqlCommand();

            try

            {

                PrepareCommand(cmd, connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);



                // Create a reader

                SqlDataReader dataReader;



                // Call ExecuteReader with the appropriate CommandBehavior

                if (connectionOwnership == SqlConnectionOwnership.External)

                {

                    dataReader = cmd.ExecuteReader();

                }

                else

                {

                    dataReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);

                }



                //We need to Close the DataReader in order to get the Return value

                //if (dataReader.IsClosed == false)

                //    dataReader.Close();



                // Detach the SqlParameters from the command object, so they can be used again.

                // HACK: There is a problem here, the output parameter values are fletched 

                // when the reader is closed, so if the parameters are detached from the command

                // then the SqlReader can´t set its values. 

                // When this happen, the parameters can´t be used again in other command.

                bool canClear = true;

                foreach (SqlParameter commandParameter in cmd.Parameters)

                {

                    if (commandParameter.Direction != ParameterDirection.Input)

                        canClear = false;

                }



                if (canClear)

                {

                    cmd.Parameters.Clear();

                }



                return dataReader;

            }

            catch

            {

                if (mustCloseConnection)

                    connection.Close();

                throw;

            }

        }



        /// <summary>

        /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the database specified in 

        /// the connection string. 

        /// </summary>

        /// <remarks>

        /// e.g.:  

        ///  SqlDataReader dr = ExecuteReader(connString, CommandType.StoredProcedure, "GetOrders");

        /// </remarks>

        /// <param name="connectionString">A valid connection string for a SqlConnection</param>

        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>

        /// <param name="commandText">The stored procedure name or T-SQL command</param>

        /// <returns>A SqlDataReader containing the resultset generated by the command</returns>

        internal static SqlDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText)

        {

            // Pass through the call providing null for the set of SqlParameters

            return ExecuteReader(connectionString, commandType, commandText, (SqlParameter[])null);

        }



        /// <summary>

        /// Execute a SqlCommand (that returns a resultset) against the database specified in the connection string 

        /// using the provided parameters.

        /// </summary>

        /// <remarks>

        /// e.g.:  

        ///  SqlDataReader dr = ExecuteReader(connString, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));

        /// </remarks>

        /// <param name="connectionString">A valid connection string for a SqlConnection</param>

        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>

        /// <param name="commandText">The stored procedure name or T-SQL command</param>

        /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>

        /// <returns>A SqlDataReader containing the resultset generated by the command</returns>

        internal static SqlDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)

        {

            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");

            SqlConnection connection = null;

            try

            {

                connection = new SqlConnection(connectionString);

                connection.Open();



                // Call the private overload that takes an internally owned connection in place of the connection string

                return ExecuteReader(connection, null, commandType, commandText, commandParameters, SqlConnectionOwnership.Internal); //change From Internal to External

            }

            catch

            {

                // If we fail to return the SqlDatReader, we need to close the connection ourselves

                if (connection != null) connection.Close();

                throw;

            }



        }



        /// <summary>

        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the database specified in 

        /// the connection string using the provided parameter values.  This method will query the database to discover the parameters for the 

        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.

        /// </summary>

        /// <remarks>

        /// This method provides no access to output parameters or the stored procedure's return value parameter.

        /// 

        /// e.g.:  

        ///  SqlDataReader dr = ExecuteReader(connString, "GetOrders", 24, 36);

        /// </remarks>

        /// <param name="connectionString">A valid connection string for a SqlConnection</param>

        /// <param name="spName">The name of the stored procedure</param>

        /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>

        /// <returns>A SqlDataReader containing the resultset generated by the command</returns>

        internal static SqlDataReader ExecuteReader(string connectionString, string spName, params object[] parameterValues)

        {

            SqlDataReader drReturn;

            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");

            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");



            // If we receive parameter values, we need to figure out where they go

            if ((parameterValues != null) && (parameterValues.Length > 0))

            {

                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName,true);



                AssignParameterValues(commandParameters, parameterValues);



                //return ExecuteReader(connectionString, CommandType.StoredProcedure, spName, commandParameters);

                drReturn = ExecuteReader(connectionString, CommandType.StoredProcedure, spName, commandParameters);



                



               // if (drReturn.IsClosed == false)

               //     drReturn.Close();



                UpdateParameterValues(commandParameters, parameterValues);

                return drReturn; 

            }

            else

            {

                // Otherwise we can just call the SP without params

                //return ExecuteReader(connectionString, CommandType.StoredProcedure, spName);

                drReturn = ExecuteReader(connectionString, CommandType.StoredProcedure, spName);

                return drReturn;

            }



        

           

        }



        /// <summary>

        /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlConnection. 

        /// </summary>

        /// <remarks>

        /// e.g.:  

        ///  SqlDataReader dr = ExecuteReader(conn, CommandType.StoredProcedure, "GetOrders");

        /// </remarks>

        /// <param name="connection">A valid SqlConnection</param>

        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>

        /// <param name="commandText">The stored procedure name or T-SQL command</param>

        /// <returns>A SqlDataReader containing the resultset generated by the command</returns>

        internal static SqlDataReader ExecuteReader(SqlConnection connection, CommandType commandType, string commandText)

        {

            // Pass through the call providing null for the set of SqlParameters

            return ExecuteReader(connection, commandType, commandText, (SqlParameter[])null);

        }



        /// <summary>

        /// Execute a SqlCommand (that returns a resultset) against the specified SqlConnection 

        /// using the provided parameters.

        /// </summary>

        /// <remarks>

        /// e.g.:  

        ///  SqlDataReader dr = ExecuteReader(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));

        /// </remarks>

        /// <param name="connection">A valid SqlConnection</param>

        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>

        /// <param name="commandText">The stored procedure name or T-SQL command</param>

        /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>

        /// <returns>A SqlDataReader containing the resultset generated by the command</returns>

        internal static SqlDataReader ExecuteReader(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)

        {

            // Pass through the call to the private overload using a null transaction value and an externally owned connection

            return ExecuteReader(connection, (SqlTransaction)null, commandType, commandText, commandParameters, SqlConnectionOwnership.External);

        }



        /// <summary>

        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection 

        /// using the provided parameter values.  This method will query the database to discover the parameters for the 

        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.

        /// </summary>

        /// <remarks>

        /// This method provides no access to output parameters or the stored procedure's return value parameter.

        /// 

        /// e.g.:  

        ///  SqlDataReader dr = ExecuteReader(conn, "GetOrders", 24, 36);

        /// </remarks>

        /// <param name="connection">A valid SqlConnection</param>

        /// <param name="spName">The name of the stored procedure</param>

        /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>

        /// <returns>A SqlDataReader containing the resultset generated by the command</returns>

        internal static SqlDataReader ExecuteReader(SqlConnection connection, string spName, params object[] parameterValues)

        {

            if (connection == null) throw new ArgumentNullException("connection");

            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");



            // If we receive parameter values, we need to figure out where they go

            if ((parameterValues != null) && (parameterValues.Length > 0))

            {

                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);



                AssignParameterValues(commandParameters, parameterValues);



                return ExecuteReader(connection, CommandType.StoredProcedure, spName, commandParameters);

            }

            else

            {

                // Otherwise we can just call the SP without params

                return ExecuteReader(connection, CommandType.StoredProcedure, spName);

            }

        }



        /// <summary>

        /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlTransaction. 

        /// </summary>

        /// <remarks>

        /// e.g.:  

        ///  SqlDataReader dr = ExecuteReader(trans, CommandType.StoredProcedure, "GetOrders");

        /// </remarks>

        /// <param name="transaction">A valid SqlTransaction</param>

        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>

        /// <param name="commandText">The stored procedure name or T-SQL command</param>

        /// <returns>A SqlDataReader containing the resultset generated by the command</returns>

        internal static SqlDataReader ExecuteReader(SqlTransaction transaction, CommandType commandType, string commandText)

        {

            // Pass through the call providing null for the set of SqlParameters

            return ExecuteReader(transaction, commandType, commandText, (SqlParameter[])null);

        }



        /// <summary>

        /// Execute a SqlCommand (that returns a resultset) against the specified SqlTransaction

        /// using the provided parameters.

        /// </summary>

        /// <remarks>

        /// e.g.:  

        ///   SqlDataReader dr = ExecuteReader(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));

        /// </remarks>

        /// <param name="transaction">A valid SqlTransaction</param>

        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>

        /// <param name="commandText">The stored procedure name or T-SQL command</param>

        /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>

        /// <returns>A SqlDataReader containing the resultset generated by the command</returns>

        internal static SqlDataReader ExecuteReader(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)

        {

            if (transaction == null) throw new ArgumentNullException("transaction");

            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");



            // Pass through to private overload, indicating that the connection is owned by the caller

            return ExecuteReader(transaction.Connection, transaction, commandType, commandText, commandParameters, SqlConnectionOwnership.External);

        }



        /// <summary>

        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified

        /// SqlTransaction using the provided parameter values.  This method will query the database to discover the parameters for the 

        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.

        /// </summary>

        /// <remarks>

        /// This method provides no access to output parameters or the stored procedure's return value parameter.

        /// 

        /// e.g.:  

        ///  SqlDataReader dr = ExecuteReader(trans, "GetOrders", 24, 36);

        /// </remarks>

        /// <param name="transaction">A valid SqlTransaction</param>

        /// <param name="spName">The name of the stored procedure</param>

        /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>

        /// <returns>A SqlDataReader containing the resultset generated by the command</returns>

        internal static SqlDataReader ExecuteReader(SqlTransaction transaction, string spName, params object[] parameterValues)

        {

            if (transaction == null) throw new ArgumentNullException("transaction");

            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");

            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");



            // If we receive parameter values, we need to figure out where they go

            if ((parameterValues != null) && (parameterValues.Length > 0))

            {

                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);



                AssignParameterValues(commandParameters, parameterValues);



                return ExecuteReader(transaction, CommandType.StoredProcedure, spName, commandParameters);

            }

            else

            {

                // Otherwise we can just call the SP without params

                return ExecuteReader(transaction, CommandType.StoredProcedure, spName);

            }

        }



        #endregion ExecuteReader



        #region ExecuteScalar



        /// <summary>

        /// Execute a SqlCommand (that returns a 1x1 resultset and takes no parameters) against the database specified in 

        /// the connection string. 

        /// </summary>

        /// <remarks>

        /// e.g.:  

        ///  int orderCount = (int)ExecuteScalar(connString, CommandType.StoredProcedure, "GetOrderCount");

        /// </remarks>

        /// <param name="connectionString">A valid connection string for a SqlConnection</param>

        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>

        /// <param name="commandText">The stored procedure name or T-SQL command</param>

        /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>

        internal static object ExecuteScalar(string connectionString, CommandType commandType, string commandText)

        {

            // Pass through the call providing null for the set of SqlParameters

            return ExecuteScalar(connectionString, commandType, commandText, (SqlParameter[])null);

        }



        /// <summary>

        /// Execute a SqlCommand (that returns a 1x1 resultset) against the database specified in the connection string 

        /// using the provided parameters.

        /// </summary>

        /// <remarks>

        /// e.g.:  

        ///  int orderCount = (int)ExecuteScalar(connString, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24));

        /// </remarks>

        /// <param name="connectionString">A valid connection string for a SqlConnection</param>

        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>

        /// <param name="commandText">The stored procedure name or T-SQL command</param>

        /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>

        /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>

        internal static object ExecuteScalar(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)

        {

            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");

            // Create & open a SqlConnection, and dispose of it after we are done

            using (SqlConnection connection = new SqlConnection(connectionString))

            {

                connection.Open();



                // Call the overload that takes a connection in place of the connection string

                return ExecuteScalar(connection, commandType, commandText, commandParameters);

            }

        }



        /// <summary>

        /// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the database specified in 

        /// the connection string using the provided parameter values.  This method will query the database to discover the parameters for the 

        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.

        /// </summary>

        /// <remarks>

        /// This method provides no access to output parameters or the stored procedure's return value parameter.

        /// 

        /// e.g.:  

        ///  int orderCount = (int)ExecuteScalar(connString, "GetOrderCount", 24, 36);

        /// </remarks>

        /// <param name="connectionString">A valid connection string for a SqlConnection</param>

        /// <param name="spName">The name of the stored procedure</param>

        /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>

        /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>

        internal static object ExecuteScalar(string connectionString, string spName, params object[] parameterValues)

        {

            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");

            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");



            // If we receive parameter values, we need to figure out where they go

            if ((parameterValues != null) && (parameterValues.Length > 0))

            {

                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)

                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);



                // Assign the provided values to these parameters based on parameter order

                AssignParameterValues(commandParameters, parameterValues);



                // Call the overload that takes an array of SqlParameters

                return ExecuteScalar(connectionString, CommandType.StoredProcedure, spName, commandParameters);

            }

            else

            {

                // Otherwise we can just call the SP without params

                return ExecuteScalar(connectionString, CommandType.StoredProcedure, spName);

            }

        }



        /// <summary>

        /// Execute a SqlCommand (that returns a 1x1 resultset and takes no parameters) against the provided SqlConnection. 

        /// </summary>

        /// <remarks>

        /// e.g.:  

        ///  int orderCount = (int)ExecuteScalar(conn, CommandType.StoredProcedure, "GetOrderCount");

        /// </remarks>

        /// <param name="connection">A valid SqlConnection</param>

        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>

        /// <param name="commandText">The stored procedure name or T-SQL command</param>

        /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>

        internal static object ExecuteScalar(SqlConnection connection, CommandType commandType, string commandText)

        {

            // Pass through the call providing null for the set of SqlParameters

            return ExecuteScalar(connection, commandType, commandText, (SqlParameter[])null);

        }



        /// <summary>

        /// Execute a SqlCommand (that returns a 1x1 resultset) against the specified SqlConnection 

        /// using the provided parameters.

        /// </summary>

        /// <remarks>

        /// e.g.:  

        ///  int orderCount = (int)ExecuteScalar(conn, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24));

        /// </remarks>

        /// <param name="connection">A valid SqlConnection</param>

        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>

        /// <param name="commandText">The stored procedure name or T-SQL command</param>

        /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>

        /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>

        internal static object ExecuteScalar(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)

        {

            if (connection == null) throw new ArgumentNullException("connection");



            // Create a command and prepare it for execution

            SqlCommand cmd = new SqlCommand();



            bool mustCloseConnection = false;

            PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection);



            // Execute the command & return the results

            object retval = cmd.ExecuteScalar();



            // Detach the SqlParameters from the command object, so they can be used again

            cmd.Parameters.Clear();



            if (mustCloseConnection)

                connection.Close();



            return retval;

        }



        /// <summary>

        /// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the specified SqlConnection 

        /// using the provided parameter values.  This method will query the database to discover the parameters for the 

        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.

        /// </summary>

        /// <remarks>

        /// This method provides no access to output parameters or the stored procedure's return value parameter.

        /// 

        /// e.g.:  

        ///  int orderCount = (int)ExecuteScalar(conn, "GetOrderCount", 24, 36);

        /// </remarks>

        /// <param name="connection">A valid SqlConnection</param>

        /// <param name="spName">The name of the stored procedure</param>

        /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>

        /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>

        internal static object ExecuteScalar(SqlConnection connection, string spName, params object[] parameterValues)

        {

            if (connection == null) throw new ArgumentNullException("connection");

            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");



            // If we receive parameter values, we need to figure out where they go

            if ((parameterValues != null) && (parameterValues.Length > 0))

            {

                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)

                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);



                // Assign the provided values to these parameters based on parameter order

                AssignParameterValues(commandParameters, parameterValues);



                // Call the overload that takes an array of SqlParameters

                return ExecuteScalar(connection, CommandType.StoredProcedure, spName, commandParameters);

            }

            else

            {

                // Otherwise we can just call the SP without params

                return ExecuteScalar(connection, CommandType.StoredProcedure, spName);

            }

        }



        /// <summary>

        /// Execute a SqlCommand (that returns a 1x1 resultset and takes no parameters) against the provided SqlTransaction. 

        /// </summary>

        /// <remarks>

        /// e.g.:  

        ///  int orderCount = (int)ExecuteScalar(trans, CommandType.StoredProcedure, "GetOrderCount");

        /// </remarks>

        /// <param name="transaction">A valid SqlTransaction</param>

        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>

        /// <param name="commandText">The stored procedure name or T-SQL command</param>

        /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>

        internal static object ExecuteScalar(SqlTransaction transaction, CommandType commandType, string commandText)

        {

            // Pass through the call providing null for the set of SqlParameters

            return ExecuteScalar(transaction, commandType, commandText, (SqlParameter[])null);

        }



        /// <summary>

        /// Execute a SqlCommand (that returns a 1x1 resultset) against the specified SqlTransaction

        /// using the provided parameters.

        /// </summary>

        /// <remarks>

        /// e.g.:  

        ///  int orderCount = (int)ExecuteScalar(trans, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24));

        /// </remarks>

        /// <param name="transaction">A valid SqlTransaction</param>

        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>

        /// <param name="commandText">The stored procedure name or T-SQL command</param>

        /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>

        /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>

        internal static object ExecuteScalar(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)

        {

            if (transaction == null) throw new ArgumentNullException("transaction");

            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");



            // Create a command and prepare it for execution

            SqlCommand cmd = new SqlCommand();

            bool mustCloseConnection = false;

            PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);



            // Execute the command & return the results

            object retval = cmd.ExecuteScalar();



            // Detach the SqlParameters from the command object, so they can be used again

            cmd.Parameters.Clear();

            return retval;

        }



        /// <summary>

        /// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the specified

        /// SqlTransaction using the provided parameter values.  This method will query the database to discover the parameters for the 

        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.

        /// </summary>

        /// <remarks>

        /// This method provides no access to output parameters or the stored procedure's return value parameter.

        /// 

        /// e.g.:  

        ///  int orderCount = (int)ExecuteScalar(trans, "GetOrderCount", 24, 36);

        /// </remarks>

        /// <param name="transaction">A valid SqlTransaction</param>

        /// <param name="spName">The name of the stored procedure</param>

        /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>

        /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>

        internal static object ExecuteScalar(SqlTransaction transaction, string spName, params object[] parameterValues)

        {

            if (transaction == null) throw new ArgumentNullException("transaction");

            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");

            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");



            // If we receive parameter values, we need to figure out where they go

            if ((parameterValues != null) && (parameterValues.Length > 0))

            {

                // PPull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)

                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);



                // Assign the provided values to these parameters based on parameter order

                AssignParameterValues(commandParameters, parameterValues);



                // Call the overload that takes an array of SqlParameters

                return ExecuteScalar(transaction, CommandType.StoredProcedure, spName, commandParameters);

            }

            else

            {

                // Otherwise we can just call the SP without params

                return ExecuteScalar(transaction, CommandType.StoredProcedure, spName);

            }

        }



        #endregion ExecuteScalar



        #region ExecuteXmlReader

        /// <summary>

        /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlConnection. 

        /// </summary>

        /// <remarks>

        /// e.g.:  

        ///  XmlReader r = ExecuteXmlReader(conn, CommandType.StoredProcedure, "GetOrders");

        /// </remarks>

        /// <param name="connection">A valid SqlConnection</param>

        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>

        /// <param name="commandText">The stored procedure name or T-SQL command using "FOR XML AUTO"</param>

        /// <returns>An XmlReader containing the resultset generated by the command</returns>

        internal static XmlReader ExecuteXmlReader(SqlConnection connection, CommandType commandType, string commandText)

        {

            // Pass through the call providing null for the set of SqlParameters

            return ExecuteXmlReader(connection, commandType, commandText, (SqlParameter[])null);

        }



        /// <summary>

        /// Execute a SqlCommand (that returns a resultset) against the specified SqlConnection 

        /// using the provided parameters.

        /// </summary>

        /// <remarks>

        /// e.g.:  

        ///  XmlReader r = ExecuteXmlReader(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));

        /// </remarks>

        /// <param name="connection">A valid SqlConnection</param>

        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>

        /// <param name="commandText">The stored procedure name or T-SQL command using "FOR XML AUTO"</param>

        /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>

        /// <returns>An XmlReader containing the resultset generated by the command</returns>

        internal static XmlReader ExecuteXmlReader(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)

        {

            if (connection == null) throw new ArgumentNullException("connection");



            bool mustCloseConnection = false;

            // Create a command and prepare it for execution

            SqlCommand cmd = new SqlCommand();

            try

            {

                PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection);



                // Create the DataAdapter & DataSet

                XmlReader retval = cmd.ExecuteXmlReader();



                // Detach the SqlParameters from the command object, so they can be used again

                cmd.Parameters.Clear();



                return retval;

            }

            catch

            {

                if (mustCloseConnection)

                    connection.Close();

                throw;

            }

        }



        /// <summary>

        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection 

        /// using the provided parameter values.  This method will query the database to discover the parameters for the 

        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.

        /// </summary>

        /// <remarks>

        /// This method provides no access to output parameters or the stored procedure's return value parameter.

        /// 

        /// e.g.:  

        ///  XmlReader r = ExecuteXmlReader(conn, "GetOrders", 24, 36);

        /// </remarks>

        /// <param name="connection">A valid SqlConnection</param>

        /// <param name="spName">The name of the stored procedure using "FOR XML AUTO"</param>

        /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>

        /// <returns>An XmlReader containing the resultset generated by the command</returns>

        internal static XmlReader ExecuteXmlReader(SqlConnection connection, string spName, params object[] parameterValues)

        {

            if (connection == null) throw new ArgumentNullException("connection");

            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");



            // If we receive parameter values, we need to figure out where they go

            if ((parameterValues != null) && (parameterValues.Length > 0))

            {

                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)

                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);



                // Assign the provided values to these parameters based on parameter order

                AssignParameterValues(commandParameters, parameterValues);



                // Call the overload that takes an array of SqlParameters

                return ExecuteXmlReader(connection, CommandType.StoredProcedure, spName, commandParameters);

            }

            else

            {

                // Otherwise we can just call the SP without params

                return ExecuteXmlReader(connection, CommandType.StoredProcedure, spName);

            }

        }



        /// <summary>

        /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlTransaction. 

        /// </summary>

        /// <remarks>

        /// e.g.:  

        ///  XmlReader r = ExecuteXmlReader(trans, CommandType.StoredProcedure, "GetOrders");

        /// </remarks>

        /// <param name="transaction">A valid SqlTransaction</param>

        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>

        /// <param name="commandText">The stored procedure name or T-SQL command using "FOR XML AUTO"</param>

        /// <returns>An XmlReader containing the resultset generated by the command</returns>

        internal static XmlReader ExecuteXmlReader(SqlTransaction transaction, CommandType commandType, string commandText)

        {

            // Pass through the call providing null for the set of SqlParameters

            return ExecuteXmlReader(transaction, commandType, commandText, (SqlParameter[])null);

        }



        /// <summary>

        /// Execute a SqlCommand (that returns a resultset) against the specified SqlTransaction

        /// using the provided parameters.

        /// </summary>

        /// <remarks>

        /// e.g.:  

        ///  XmlReader r = ExecuteXmlReader(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));

        /// </remarks>

        /// <param name="transaction">A valid SqlTransaction</param>

        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>

        /// <param name="commandText">The stored procedure name or T-SQL command using "FOR XML AUTO"</param>

        /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>

        /// <returns>An XmlReader containing the resultset generated by the command</returns>

        internal static XmlReader ExecuteXmlReader(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)

        {

            if (transaction == null) throw new ArgumentNullException("transaction");

            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");



            // Create a command and prepare it for execution

            SqlCommand cmd = new SqlCommand();

            bool mustCloseConnection = false;

            PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);



            // Create the DataAdapter & DataSet

            XmlReader retval = cmd.ExecuteXmlReader();



            // Detach the SqlParameters from the command object, so they can be used again

            cmd.Parameters.Clear();

            return retval;

        }



        /// <summary>

        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified 

        /// SqlTransaction using the provided parameter values.  This method will query the database to discover the parameters for the 

        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.

        /// </summary>

        /// <remarks>

        /// This method provides no access to output parameters or the stored procedure's return value parameter.

        /// 

        /// e.g.:  

        ///  XmlReader r = ExecuteXmlReader(trans, "GetOrders", 24, 36);

        /// </remarks>

        /// <param name="transaction">A valid SqlTransaction</param>

        /// <param name="spName">The name of the stored procedure</param>

        /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>

        /// <returns>A dataset containing the resultset generated by the command</returns>

        internal static XmlReader ExecuteXmlReader(SqlTransaction transaction, string spName, params object[] parameterValues)

        {

            if (transaction == null) throw new ArgumentNullException("transaction");

            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");

            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");



            // If we receive parameter values, we need to figure out where they go

            if ((parameterValues != null) && (parameterValues.Length > 0))

            {

                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)

                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);



                // Assign the provided values to these parameters based on parameter order

                AssignParameterValues(commandParameters, parameterValues);



                // Call the overload that takes an array of SqlParameters

                return ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName, commandParameters);

            }

            else

            {

                // Otherwise we can just call the SP without params

                return ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName);

            }

        }



        #endregion ExecuteXmlReader



        #region FillDataset

        /// <summary>

        /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the database specified in 

        /// the connection string. 

        /// </summary>

        /// <remarks>

        /// e.g.:  

        ///  FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});

        /// </remarks>

        /// <param name="connectionString">A valid connection string for a SqlConnection</param>

        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>

        /// <param name="commandText">The stored procedure name or T-SQL command</param>

        /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>

        /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced

        /// by a user defined name (probably the actual table name)</param>

        internal static void FillDataset(string connectionString, CommandType commandType, string commandText, DataSet dataSet, string[] tableNames)

        {

            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");

            if (dataSet == null) throw new ArgumentNullException("dataSet");



            // Create & open a SqlConnection, and dispose of it after we are done

            using (SqlConnection connection = new SqlConnection(connectionString))

            {

                connection.Open();



                // Call the overload that takes a connection in place of the connection string

                FillDataset(connection, commandType, commandText, dataSet, tableNames);

            }

        }



        /// <summary>

        /// Execute a SqlCommand (that returns a resultset) against the database specified in the connection string 

        /// using the provided parameters.

        /// </summary>

        /// <remarks>

        /// e.g.:  

        ///  FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));

        /// </remarks>

        /// <param name="connectionString">A valid connection string for a SqlConnection</param>

        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>

        /// <param name="commandText">The stored procedure name or T-SQL command</param>

        /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>

        /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>

        /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced

        /// by a user defined name (probably the actual table name)

        /// </param>

        internal static void FillDataset(string connectionString, CommandType commandType,

            string commandText, DataSet dataSet, string[] tableNames,

            params SqlParameter[] commandParameters)

        {

            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");

            if (dataSet == null) throw new ArgumentNullException("dataSet");

            // Create & open a SqlConnection, and dispose of it after we are done

            using (SqlConnection connection = new SqlConnection(connectionString))

            {

                connection.Open();



                // Call the overload that takes a connection in place of the connection string

                FillDataset(connection, commandType, commandText, dataSet, tableNames, commandParameters);

            }

        }



        /// <summary>

        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the database specified in 

        /// the connection string using the provided parameter values.  This method will query the database to discover the parameters for the 

        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.

        /// </summary>

        /// <remarks>

        /// This method provides no access to output parameters or the stored procedure's return value parameter.

        /// 

        /// e.g.:  

        ///  FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, 24);

        /// </remarks>

        /// <param name="connectionString">A valid connection string for a SqlConnection</param>

        /// <param name="spName">The name of the stored procedure</param>

        /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>

        /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced

        /// by a user defined name (probably the actual table name)

        /// </param>    

        /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>

        internal static void FillDataset(string connectionString, string spName,

            DataSet dataSet, string[] tableNames,

            params object[] parameterValues)

        {

            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");

            if (dataSet == null) throw new ArgumentNullException("dataSet");

            // Create & open a SqlConnection, and dispose of it after we are done

            using (SqlConnection connection = new SqlConnection(connectionString))

            {

                connection.Open();



                // Call the overload that takes a connection in place of the connection string

                FillDataset(connection, spName, dataSet, tableNames, parameterValues);

            }

        }



        /// <summary>

        /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlConnection. 

        /// </summary>

        /// <remarks>

        /// e.g.:  

        ///  FillDataset(conn, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});

        /// </remarks>

        /// <param name="connection">A valid SqlConnection</param>

        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>

        /// <param name="commandText">The stored procedure name or T-SQL command</param>

        /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>

        /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced

        /// by a user defined name (probably the actual table name)

        /// </param>    

        internal static void FillDataset(SqlConnection connection, CommandType commandType,

            string commandText, DataSet dataSet, string[] tableNames)

        {

            FillDataset(connection, commandType, commandText, dataSet, tableNames, null);

        }



        /// <summary>

        /// Execute a SqlCommand (that returns a resultset) against the specified SqlConnection 

        /// using the provided parameters.

        /// </summary>

        /// <remarks>

        /// e.g.:  

        ///  FillDataset(conn, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));

        /// </remarks>

        /// <param name="connection">A valid SqlConnection</param>

        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>

        /// <param name="commandText">The stored procedure name or T-SQL command</param>

        /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>

        /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced

        /// by a user defined name (probably the actual table name)

        /// </param>

        /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>

        internal static void FillDataset(SqlConnection connection, CommandType commandType,

            string commandText, DataSet dataSet, string[] tableNames,

            params SqlParameter[] commandParameters)

        {

            FillDataset(connection, null, commandType, commandText, dataSet, tableNames, commandParameters);

        }



        /// <summary>

        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection 

        /// using the provided parameter values.  This method will query the database to discover the parameters for the 

        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.

        /// </summary>

        /// <remarks>

        /// This method provides no access to output parameters or the stored procedure's return value parameter.

        /// 

        /// e.g.:  

        ///  FillDataset(conn, "GetOrders", ds, new string[] {"orders"}, 24, 36);

        /// </remarks>

        /// <param name="connection">A valid SqlConnection</param>

        /// <param name="spName">The name of the stored procedure</param>

        /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>

        /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced

        /// by a user defined name (probably the actual table name)

        /// </param>

        /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>

        internal static void FillDataset(SqlConnection connection, string spName,

            DataSet dataSet, string[] tableNames,

            params object[] parameterValues)

        {

            if (connection == null) throw new ArgumentNullException("connection");

            if (dataSet == null) throw new ArgumentNullException("dataSet");

            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");



            // If we receive parameter values, we need to figure out where they go

            if ((parameterValues != null) && (parameterValues.Length > 0))

            {

                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)

                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);



                // Assign the provided values to these parameters based on parameter order

                AssignParameterValues(commandParameters, parameterValues);



                // Call the overload that takes an array of SqlParameters

                FillDataset(connection, CommandType.StoredProcedure, spName, dataSet, tableNames, commandParameters);

            }

            else

            {

                // Otherwise we can just call the SP without params

                FillDataset(connection, CommandType.StoredProcedure, spName, dataSet, tableNames);

            }

        }



        /// <summary>

        /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlTransaction. 

        /// </summary>

        /// <remarks>

        /// e.g.:  

        ///  FillDataset(trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});

        /// </remarks>

        /// <param name="transaction">A valid SqlTransaction</param>

        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>

        /// <param name="commandText">The stored procedure name or T-SQL command</param>

        /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>

        /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced

        /// by a user defined name (probably the actual table name)

        /// </param>

        internal static void FillDataset(SqlTransaction transaction, CommandType commandType,

            string commandText,

            DataSet dataSet, string[] tableNames)

        {

            FillDataset(transaction, commandType, commandText, dataSet, tableNames, null);

        }



        /// <summary>

        /// Execute a SqlCommand (that returns a resultset) against the specified SqlTransaction

        /// using the provided parameters.

        /// </summary>

        /// <remarks>

        /// e.g.:  

        ///  FillDataset(trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));

        /// </remarks>

        /// <param name="transaction">A valid SqlTransaction</param>

        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>

        /// <param name="commandText">The stored procedure name or T-SQL command</param>

        /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>

        /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced

        /// by a user defined name (probably the actual table name)

        /// </param>

        /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>

        internal static void FillDataset(SqlTransaction transaction, CommandType commandType,

            string commandText, DataSet dataSet, string[] tableNames,

            params SqlParameter[] commandParameters)

        {

            FillDataset(transaction.Connection, transaction, commandType, commandText, dataSet, tableNames, commandParameters);

        }



        /// <summary>

        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified 

        /// SqlTransaction using the provided parameter values.  This method will query the database to discover the parameters for the 

        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.

        /// </summary>

        /// <remarks>

        /// This method provides no access to output parameters or the stored procedure's return value parameter.

        /// 

        /// e.g.:  

        ///  FillDataset(trans, "GetOrders", ds, new string[]{"orders"}, 24, 36);

        /// </remarks>

        /// <param name="transaction">A valid SqlTransaction</param>

        /// <param name="spName">The name of the stored procedure</param>

        /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>

        /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced

        /// by a user defined name (probably the actual table name)

        /// </param>

        /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>

        internal static void FillDataset(SqlTransaction transaction, string spName,

            DataSet dataSet, string[] tableNames,

            params object[] parameterValues)

        {

            if (transaction == null) throw new ArgumentNullException("transaction");

            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");

            if (dataSet == null) throw new ArgumentNullException("dataSet");

            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");



            // If we receive parameter values, we need to figure out where they go

            if ((parameterValues != null) && (parameterValues.Length > 0))

            {

                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)

                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);



                // Assign the provided values to these parameters based on parameter order

                AssignParameterValues(commandParameters, parameterValues);



                // Call the overload that takes an array of SqlParameters

                FillDataset(transaction, CommandType.StoredProcedure, spName, dataSet, tableNames, commandParameters);

            }

            else

            {

                // Otherwise we can just call the SP without params

                FillDataset(transaction, CommandType.StoredProcedure, spName, dataSet, tableNames);

            }

        }



        /// <summary>

        /// Private helper method that execute a SqlCommand (that returns a resultset) against the specified SqlTransaction and SqlConnection

        /// using the provided parameters.

        /// </summary>

        /// <remarks>

        /// e.g.:  

        ///  FillDataset(conn, trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));

        /// </remarks>

        /// <param name="connection">A valid SqlConnection</param>

        /// <param name="transaction">A valid SqlTransaction</param>

        /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>

        /// <param name="commandText">The stored procedure name or T-SQL command</param>

        /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>

        /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced

        /// by a user defined name (probably the actual table name)

        /// </param>

        /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>

        private static void FillDataset(SqlConnection connection, SqlTransaction transaction, CommandType commandType,

            string commandText, DataSet dataSet, string[] tableNames,

            params SqlParameter[] commandParameters)

        {

            if (connection == null) throw new ArgumentNullException("connection");

            if (dataSet == null) throw new ArgumentNullException("dataSet");



            // Create a command and prepare it for execution

            SqlCommand command = new SqlCommand();

            bool mustCloseConnection = false;

            PrepareCommand(command, connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);



            // Create the DataAdapter & DataSet

            using (SqlDataAdapter dataAdapter = new SqlDataAdapter(command))

            {



                // Add the table mappings specified by the user

                if (tableNames != null && tableNames.Length > 0)

                {

                    string tableName = "Table";

                    for (int index = 0; index < tableNames.Length; index++)

                    {

                        if (tableNames[index] == null || tableNames[index].Length == 0) throw new ArgumentException("The tableNames parameter must contain a list of tables, a value was provided as null or empty string.", "tableNames");

                        dataAdapter.TableMappings.Add(tableName, tableNames[index]);

                        tableName += (index + 1).ToString();

                    }

                }



                // Fill the DataSet using default values for DataTable names, etc

                dataAdapter.Fill(dataSet);



                // Detach the SqlParameters from the command object, so they can be used again

                command.Parameters.Clear();

            }



            if (mustCloseConnection)

                connection.Close();

        }

        #endregion



        #region UpdateDataset

        /// <summary>

        /// Executes the respective command for each inserted, updated, or deleted row in the DataSet.

        /// </summary>

        /// <remarks>

        /// e.g.:  

        ///  UpdateDataset(conn, insertCommand, deleteCommand, updateCommand, dataSet, "Order");

        /// </remarks>

        /// <param name="insertCommand">A valid transact-SQL statement or stored procedure to insert new records into the data source</param>

        /// <param name="deleteCommand">A valid transact-SQL statement or stored procedure to delete records from the data source</param>

        /// <param name="updateCommand">A valid transact-SQL statement or stored procedure used to update records in the data source</param>

        /// <param name="dataSet">The DataSet used to update the data source</param>

        /// <param name="tableName">The DataTable used to update the data source.</param>

        internal static void UpdateDataset(SqlCommand insertCommand, SqlCommand deleteCommand, SqlCommand updateCommand, DataSet dataSet, string tableName)

        {

            if (insertCommand == null) throw new ArgumentNullException("insertCommand");

            if (deleteCommand == null) throw new ArgumentNullException("deleteCommand");

            if (updateCommand == null) throw new ArgumentNullException("updateCommand");

            if (tableName == null || tableName.Length == 0) throw new ArgumentNullException("tableName");



            // Create a SqlDataAdapter, and dispose of it after we are done

            using (SqlDataAdapter dataAdapter = new SqlDataAdapter())

            {

                // Set the data adapter commands

                dataAdapter.UpdateCommand = updateCommand;

                dataAdapter.InsertCommand = insertCommand;

                dataAdapter.DeleteCommand = deleteCommand;



                // Update the dataset changes in the data source

                dataAdapter.Update(dataSet, tableName);



                // Commit all the changes made to the DataSet

                dataSet.AcceptChanges();

            }

        }

        #endregion



        #region CreateCommand

        /// <summary>

        /// Simplify the creation of a Sql command object by allowing

        /// a stored procedure and optional parameters to be provided

        /// </summary>

        /// <remarks>

        /// e.g.:  

        ///  SqlCommand command = CreateCommand(conn, "AddCustomer", "CustomerID", "CustomerName");

        /// </remarks>

        /// <param name="connection">A valid SqlConnection object</param>

        /// <param name="spName">The name of the stored procedure</param>

        /// <param name="sourceColumns">An array of string to be assigned as the source columns of the stored procedure parameters</param>

        /// <returns>A valid SqlCommand object</returns>

        internal static SqlCommand CreateCommand(SqlConnection connection, string spName, params string[] sourceColumns)

        {

            if (connection == null) throw new ArgumentNullException("connection");

            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");



            // Create a SqlCommand

            SqlCommand cmd = new SqlCommand(spName, connection);

            cmd.CommandType = CommandType.StoredProcedure;



            // If we receive parameter values, we need to figure out where they go

            if ((sourceColumns != null) && (sourceColumns.Length > 0))

            {

                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)

                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);



                // Assign the provided source columns to these parameters based on parameter order

                for (int index = 0; index < sourceColumns.Length; index++)

                    commandParameters[index].SourceColumn = sourceColumns[index];



                // Attach the discovered parameters to the SqlCommand object

                AttachParameters(cmd, commandParameters);

            }



            return cmd;

        }

        #endregion



        #region ExecuteNonQueryTypedParams

        /// <summary>

        /// Execute a stored procedure via a SqlCommand (that returns no resultset) against the database specified in 

        /// the connection string using the dataRow column values as the stored procedure's parameters values.

        /// This method will query the database to discover the parameters for the 

        /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.

        /// </summary>

        /// <param name="connectionString">A valid connection string for a SqlConnection</param>

        /// <param name="spName">The name of the stored procedure</param>

        /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>

        /// <returns>An int representing the number of rows affected by the command</returns>

        internal static int ExecuteNonQueryTypedParams(String connectionString, String spName, DataRow dataRow)

        {

            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");

            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");



            // If the row has values, the store procedure parameters must be initialized

            if (dataRow != null && dataRow.ItemArray.Length > 0)

            {

                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)

                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);



                // Set the parameters values

                AssignParameterValues(commandParameters, dataRow);



                return SqlHelper.ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName, commandParameters);

            }

            else

            {

                return SqlHelper.ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName);

            }

        }



        /// <summary>

        /// Execute a stored procedure via a SqlCommand (that returns no resultset) against the specified SqlConnection 

        /// using the dataRow column values as the stored procedure's parameters values.  

        /// This method will query the database to discover the parameters for the 

        /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.

        /// </summary>

        /// <param name="connection">A valid SqlConnection object</param>

        /// <param name="spName">The name of the stored procedure</param>

        /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>

        /// <returns>An int representing the number of rows affected by the command</returns>

        internal static int ExecuteNonQueryTypedParams(SqlConnection connection, String spName, DataRow dataRow)

        {

            if (connection == null) throw new ArgumentNullException("connection");

            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");



            // If the row has values, the store procedure parameters must be initialized

            if (dataRow != null && dataRow.ItemArray.Length > 0)

            {

                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)

                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);



                // Set the parameters values

                AssignParameterValues(commandParameters, dataRow);



                return SqlHelper.ExecuteNonQuery(connection, CommandType.StoredProcedure, spName, commandParameters);

            }

            else

            {

                return SqlHelper.ExecuteNonQuery(connection, CommandType.StoredProcedure, spName);

            }

        }



        /// <summary>

        /// Execute a stored procedure via a SqlCommand (that returns no resultset) against the specified

        /// SqlTransaction using the dataRow column values as the stored procedure's parameters values.

        /// This method will query the database to discover the parameters for the 

        /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.

        /// </summary>

        /// <param name="transaction">A valid SqlTransaction object</param>

        /// <param name="spName">The name of the stored procedure</param>

        /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>

        /// <returns>An int representing the number of rows affected by the command</returns>

        internal static int ExecuteNonQueryTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)

        {

            if (transaction == null) throw new ArgumentNullException("transaction");

            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");

            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");



            // Sf the row has values, the store procedure parameters must be initialized

            if (dataRow != null && dataRow.ItemArray.Length > 0)

            {

                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)

                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);



                // Set the parameters values

                AssignParameterValues(commandParameters, dataRow);



                return SqlHelper.ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName, commandParameters);

            }

            else

            {

                return SqlHelper.ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName);

            }

        }

        #endregion



        #region ExecuteDatasetTypedParams

        /// <summary>

        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the database specified in 

        /// the connection string using the dataRow column values as the stored procedure's parameters values.

        /// This method will query the database to discover the parameters for the 

        /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.

        /// </summary>

        /// <param name="connectionString">A valid connection string for a SqlConnection</param>

        /// <param name="spName">The name of the stored procedure</param>

        /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>

        /// <returns>A dataset containing the resultset generated by the command</returns>

        internal static DataSet ExecuteDatasetTypedParams(string connectionString, String spName, DataRow dataRow)

        {

            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");

            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");



            //If the row has values, the store procedure parameters must be initialized

            if (dataRow != null && dataRow.ItemArray.Length > 0)

            {

                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)

                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);



                // Set the parameters values

                AssignParameterValues(commandParameters, dataRow);



                return SqlHelper.ExecuteDataset(connectionString, CommandType.StoredProcedure, spName, commandParameters);

            }

            else

            {

                return SqlHelper.ExecuteDataset(connectionString, CommandType.StoredProcedure, spName);

            }

        }



        /// <summary>

        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection 

        /// using the dataRow column values as the store procedure's parameters values.

        /// This method will query the database to discover the parameters for the 

        /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.

        /// </summary>

        /// <param name="connection">A valid SqlConnection object</param>

        /// <param name="spName">The name of the stored procedure</param>

        /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>

        /// <returns>A dataset containing the resultset generated by the command</returns>

        internal static DataSet ExecuteDatasetTypedParams(SqlConnection connection, String spName, DataRow dataRow)

        {

            if (connection == null) throw new ArgumentNullException("connection");

            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");



            // If the row has values, the store procedure parameters must be initialized

            if (dataRow != null && dataRow.ItemArray.Length > 0)

            {

                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)

                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);



                // Set the parameters values

                AssignParameterValues(commandParameters, dataRow);



                return SqlHelper.ExecuteDataset(connection, CommandType.StoredProcedure, spName, commandParameters);

            }

            else

            {

                return SqlHelper.ExecuteDataset(connection, CommandType.StoredProcedure, spName);

            }

        }



        /// <summary>

        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlTransaction 

        /// using the dataRow column values as the stored procedure's parameters values.

        /// This method will query the database to discover the parameters for the 

        /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.

        /// </summary>

        /// <param name="transaction">A valid SqlTransaction object</param>

        /// <param name="spName">The name of the stored procedure</param>

        /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>

        /// <returns>A dataset containing the resultset generated by the command</returns>

        internal static DataSet ExecuteDatasetTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)

        {

            if (transaction == null) throw new ArgumentNullException("transaction");

            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");

            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");



            // If the row has values, the store procedure parameters must be initialized

            if (dataRow != null && dataRow.ItemArray.Length > 0)

            {

                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)

                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);



                // Set the parameters values

                AssignParameterValues(commandParameters, dataRow);



                return SqlHelper.ExecuteDataset(transaction, CommandType.StoredProcedure, spName, commandParameters);

            }

            else

            {

                return SqlHelper.ExecuteDataset(transaction, CommandType.StoredProcedure, spName);

            }

        }



        #endregion



        #region ExecuteReaderTypedParams

        /// <summary>

        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the database specified in 

        /// the connection string using the dataRow column values as the stored procedure's parameters values.

        /// This method will query the database to discover the parameters for the 

        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.

        /// </summary>

        /// <param name="connectionString">A valid connection string for a SqlConnection</param>

        /// <param name="spName">The name of the stored procedure</param>

        /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>

        /// <returns>A SqlDataReader containing the resultset generated by the command</returns>

        internal static SqlDataReader ExecuteReaderTypedParams(String connectionString, String spName, DataRow dataRow)

        {

            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");

            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");



            // If the row has values, the store procedure parameters must be initialized

            if (dataRow != null && dataRow.ItemArray.Length > 0)

            {

                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)

                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);



                // Set the parameters values

                AssignParameterValues(commandParameters, dataRow);



                return SqlHelper.ExecuteReader(connectionString, CommandType.StoredProcedure, spName, commandParameters);

            }

            else

            {

                return SqlHelper.ExecuteReader(connectionString, CommandType.StoredProcedure, spName);

            }

        }





        /// <summary>

        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection 

        /// using the dataRow column values as the stored procedure's parameters values.

        /// This method will query the database to discover the parameters for the 

        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.

        /// </summary>

        /// <param name="connection">A valid SqlConnection object</param>

        /// <param name="spName">The name of the stored procedure</param>

        /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>

        /// <returns>A SqlDataReader containing the resultset generated by the command</returns>

        internal static SqlDataReader ExecuteReaderTypedParams(SqlConnection connection, String spName, DataRow dataRow)

        {

            if (connection == null) throw new ArgumentNullException("connection");

            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");



            // If the row has values, the store procedure parameters must be initialized

            if (dataRow != null && dataRow.ItemArray.Length > 0)

            {

                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)

                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);



                // Set the parameters values

                AssignParameterValues(commandParameters, dataRow);



                return SqlHelper.ExecuteReader(connection, CommandType.StoredProcedure, spName, commandParameters);

            }

            else

            {

                return SqlHelper.ExecuteReader(connection, CommandType.StoredProcedure, spName);

            }

        }



        /// <summary>

        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlTransaction 

        /// using the dataRow column values as the stored procedure's parameters values.

        /// This method will query the database to discover the parameters for the 

        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.

        /// </summary>

        /// <param name="transaction">A valid SqlTransaction object</param>

        /// <param name="spName">The name of the stored procedure</param>

        /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>

        /// <returns>A SqlDataReader containing the resultset generated by the command</returns>

        internal static SqlDataReader ExecuteReaderTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)

        {

            if (transaction == null) throw new ArgumentNullException("transaction");

            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");

            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");



            // If the row has values, the store procedure parameters must be initialized

            if (dataRow != null && dataRow.ItemArray.Length > 0)

            {

                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)

                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);



                // Set the parameters values

                AssignParameterValues(commandParameters, dataRow);



                return SqlHelper.ExecuteReader(transaction, CommandType.StoredProcedure, spName, commandParameters);

            }

            else

            {

                return SqlHelper.ExecuteReader(transaction, CommandType.StoredProcedure, spName);

            }

        }

        #endregion



        #region ExecuteScalarTypedParams

        /// <summary>

        /// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the database specified in 

        /// the connection string using the dataRow column values as the stored procedure's parameters values.

        /// This method will query the database to discover the parameters for the 

        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.

        /// </summary>

        /// <param name="connectionString">A valid connection string for a SqlConnection</param>

        /// <param name="spName">The name of the stored procedure</param>

        /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>

        /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>

        internal static object ExecuteScalarTypedParams(String connectionString, String spName, DataRow dataRow)

        {

            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");

            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");



            // If the row has values, the store procedure parameters must be initialized

            if (dataRow != null && dataRow.ItemArray.Length > 0)

            {

                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)

                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);



                // Set the parameters values

                AssignParameterValues(commandParameters, dataRow);



                return SqlHelper.ExecuteScalar(connectionString, CommandType.StoredProcedure, spName, commandParameters);

            }

            else

            {

                return SqlHelper.ExecuteScalar(connectionString, CommandType.StoredProcedure, spName);

            }

        }



        /// <summary>

        /// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the specified SqlConnection 

        /// using the dataRow column values as the stored procedure's parameters values.

        /// This method will query the database to discover the parameters for the 

        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.

        /// </summary>

        /// <param name="connection">A valid SqlConnection object</param>

        /// <param name="spName">The name of the stored procedure</param>

        /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>

        /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>

        internal static object ExecuteScalarTypedParams(SqlConnection connection, String spName, DataRow dataRow)

        {

            if (connection == null) throw new ArgumentNullException("connection");

            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");



            // If the row has values, the store procedure parameters must be initialized

            if (dataRow != null && dataRow.ItemArray.Length > 0)

            {

                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)

                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);



                // Set the parameters values

                AssignParameterValues(commandParameters, dataRow);



                return SqlHelper.ExecuteScalar(connection, CommandType.StoredProcedure, spName, commandParameters);

            }

            else

            {

                return SqlHelper.ExecuteScalar(connection, CommandType.StoredProcedure, spName);

            }

        }



        /// <summary>

        /// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the specified SqlTransaction

        /// using the dataRow column values as the stored procedure's parameters values.

        /// This method will query the database to discover the parameters for the 

        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.

        /// </summary>

        /// <param name="transaction">A valid SqlTransaction object</param>

        /// <param name="spName">The name of the stored procedure</param>

        /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>

        /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>

        internal static object ExecuteScalarTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)

        {

            if (transaction == null) throw new ArgumentNullException("transaction");

            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");

            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");



            // If the row has values, the store procedure parameters must be initialized

            if (dataRow != null && dataRow.ItemArray.Length > 0)

            {

                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)

                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);



                // Set the parameters values

                AssignParameterValues(commandParameters, dataRow);



                return SqlHelper.ExecuteScalar(transaction, CommandType.StoredProcedure, spName, commandParameters);

            }

            else

            {

                return SqlHelper.ExecuteScalar(transaction, CommandType.StoredProcedure, spName);

            }

        }

        #endregion



        #region ExecuteXmlReaderTypedParams

        /// <summary>

        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection 

        /// using the dataRow column values as the stored procedure's parameters values.

        /// This method will query the database to discover the parameters for the 

        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.

        /// </summary>

        /// <param name="connection">A valid SqlConnection object</param>

        /// <param name="spName">The name of the stored procedure</param>

        /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>

        /// <returns>An XmlReader containing the resultset generated by the command</returns>

        internal static XmlReader ExecuteXmlReaderTypedParams(SqlConnection connection, String spName, DataRow dataRow)

        {

            if (connection == null) throw new ArgumentNullException("connection");

            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");



            // If the row has values, the store procedure parameters must be initialized

            if (dataRow != null && dataRow.ItemArray.Length > 0)

            {

                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)

                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);



                // Set the parameters values

                AssignParameterValues(commandParameters, dataRow);



                return SqlHelper.ExecuteXmlReader(connection, CommandType.StoredProcedure, spName, commandParameters);

            }

            else

            {

                return SqlHelper.ExecuteXmlReader(connection, CommandType.StoredProcedure, spName);

            }

        }



        /// <summary>

        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlTransaction 

        /// using the dataRow column values as the stored procedure's parameters values.

        /// This method will query the database to discover the parameters for the 

        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.

        /// </summary>

        /// <param name="transaction">A valid SqlTransaction object</param>

        /// <param name="spName">The name of the stored procedure</param>

        /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>

        /// <returns>An XmlReader containing the resultset generated by the command</returns>

        internal static XmlReader ExecuteXmlReaderTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)

        {

            if (transaction == null) throw new ArgumentNullException("transaction");

            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");

            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");



            // If the row has values, the store procedure parameters must be initialized

            if (dataRow != null && dataRow.ItemArray.Length > 0)

            {

                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)

                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);



                // Set the parameters values

                AssignParameterValues(commandParameters, dataRow);



                return SqlHelper.ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName, commandParameters);

            }

            else

            {

                return SqlHelper.ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName);

            }

        }

        #endregion



    }



    /// <summary>

    /// SqlHelperParameterCache provides functions to leverage a static cache of procedure parameters, and the

    /// ability to discover parameters for stored procedures at run-time.

    /// </summary>

    internal sealed class SqlHelperParameterCache

    {

        #region private methods, variables, and constructors



        //Since this class provides only static methods, make the default constructor private to prevent 

        //instances from being created with "new SqlHelperParameterCache()"

        private SqlHelperParameterCache() { }



        private static Hashtable paramCache = Hashtable.Synchronized(new Hashtable());



        /// <summary>

        /// Resolve at run time the appropriate set of SqlParameters for a stored procedure

        /// </summary>

        /// <param name="connection">A valid SqlConnection object</param>

        /// <param name="spName">The name of the stored procedure</param>

        /// <param name="includeReturnValueParameter">Whether or not to include their return value parameter</param>

        /// <returns>The parameter array discovered.</returns>

        private static SqlParameter[] DiscoverSpParameterSet(SqlConnection connection, string spName, bool includeReturnValueParameter)

        {

            if (connection == null) throw new ArgumentNullException("connection");

            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");



            SqlCommand cmd = new SqlCommand(spName, connection);

            cmd.CommandType = CommandType.StoredProcedure;



            connection.Open();

            SqlCommandBuilder.DeriveParameters(cmd);

            connection.Close();



            if (!includeReturnValueParameter)

            {

                cmd.Parameters.RemoveAt(0);

            }



            SqlParameter[] discoveredParameters = new SqlParameter[cmd.Parameters.Count];



            cmd.Parameters.CopyTo(discoveredParameters, 0);



            // Init the parameters with a DBNull value

            foreach (SqlParameter discoveredParameter in discoveredParameters)

            {

                discoveredParameter.Value = DBNull.Value;

            }

            return discoveredParameters;

        }



        /// <summary>

        /// Deep copy of cached SqlParameter array

        /// </summary>

        /// <param name="originalParameters"></param>

        /// <returns></returns>

        private static SqlParameter[] CloneParameters(SqlParameter[] originalParameters)

        {

            SqlParameter[] clonedParameters = new SqlParameter[originalParameters.Length];



            for (int i = 0, j = originalParameters.Length; i < j; i++)

            {

                clonedParameters[i] = (SqlParameter)((ICloneable)originalParameters[i]).Clone();

            }



            return clonedParameters;

        }



        #endregion private methods, variables, and constructors



        #region caching functions



        /// <summary>

        /// Add parameter array to the cache

        /// </summary>

        /// <param name="connectionString">A valid connection string for a SqlConnection</param>

        /// <param name="commandText">The stored procedure name or T-SQL command</param>

        /// <param name="commandParameters">An array of SqlParamters to be cached</param>

        internal static void CacheParameterSet(string connectionString, string commandText, params SqlParameter[] commandParameters)

        {

            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");

            if (commandText == null || commandText.Length == 0) throw new ArgumentNullException("commandText");



            string hashKey = connectionString + ":" + commandText;



            paramCache[hashKey] = commandParameters;

        }



        /// <summary>

        /// Retrieve a parameter array from the cache

        /// </summary>

        /// <param name="connectionString">A valid connection string for a SqlConnection</param>

        /// <param name="commandText">The stored procedure name or T-SQL command</param>

        /// <returns>An array of SqlParamters</returns>

        internal static SqlParameter[] GetCachedParameterSet(string connectionString, string commandText)

        {

            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");

            if (commandText == null || commandText.Length == 0) throw new ArgumentNullException("commandText");



            string hashKey = connectionString + ":" + commandText;



            SqlParameter[] cachedParameters = paramCache[hashKey] as SqlParameter[];

            if (cachedParameters == null)

            {

                return null;

            }

            else

            {

                return CloneParameters(cachedParameters);

            }

        }



        #endregion caching functions



        #region Parameter Discovery Functions



        /// <summary>

        /// Retrieves the set of SqlParameters appropriate for the stored procedure

        /// </summary>

        /// <remarks>

        /// This method will query the database for this information, and then store it in a cache for future requests.

        /// </remarks>

        /// <param name="connectionString">A valid connection string for a SqlConnection</param>

        /// <param name="spName">The name of the stored procedure</param>

        /// <returns>An array of SqlParameters</returns>

        internal static SqlParameter[] GetSpParameterSet(string connectionString, string spName)

        {

            return GetSpParameterSet(connectionString, spName, false);

        }



        /// <summary>

        /// Retrieves the set of SqlParameters appropriate for the stored procedure

        /// </summary>

        /// <remarks>

        /// This method will query the database for this information, and then store it in a cache for future requests.

        /// </remarks>

        /// <param name="connectionString">A valid connection string for a SqlConnection</param>

        /// <param name="spName">The name of the stored procedure</param>

        /// <param name="includeReturnValueParameter">A bool value indicating whether the return value parameter should be included in the results</param>

        /// <returns>An array of SqlParameters</returns>

        internal static SqlParameter[] GetSpParameterSet(string connectionString, string spName, bool includeReturnValueParameter)

        {

            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");

            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");



            using (SqlConnection connection = new SqlConnection(connectionString))

            {

                return GetSpParameterSetInternal(connection, spName, includeReturnValueParameter);

            }

        }



        /// <summary>

        /// Retrieves the set of SqlParameters appropriate for the stored procedure

        /// </summary>

        /// <remarks>

        /// This method will query the database for this information, and then store it in a cache for future requests.

        /// </remarks>

        /// <param name="connection">A valid SqlConnection object</param>

        /// <param name="spName">The name of the stored procedure</param>

        /// <returns>An array of SqlParameters</returns>

        internal static SqlParameter[] GetSpParameterSet(SqlConnection connection, string spName)

        {

            return GetSpParameterSet(connection, spName, false);

        }



        /// <summary>

        /// Retrieves the set of SqlParameters appropriate for the stored procedure

        /// </summary>

        /// <remarks>

        /// This method will query the database for this information, and then store it in a cache for future requests.

        /// </remarks>

        /// <param name="connection">A valid SqlConnection object</param>

        /// <param name="spName">The name of the stored procedure</param>

        /// <param name="includeReturnValueParameter">A bool value indicating whether the return value parameter should be included in the results</param>

        /// <returns>An array of SqlParameters</returns>

        internal static SqlParameter[] GetSpParameterSet(SqlConnection connection, string spName, bool includeReturnValueParameter)

        {

            if (connection == null) throw new ArgumentNullException("connection");

            using (SqlConnection clonedConnection = (SqlConnection)((ICloneable)connection).Clone())

            {

                return GetSpParameterSetInternal(clonedConnection, spName, includeReturnValueParameter);

            }

        }



        /// <summary>

        /// Retrieves the set of SqlParameters appropriate for the stored procedure

        /// </summary>

        /// <param name="connection">A valid SqlConnection object</param>

        /// <param name="spName">The name of the stored procedure</param>

        /// <param name="includeReturnValueParameter">A bool value indicating whether the return value parameter should be included in the results</param>

        /// <returns>An array of SqlParameters</returns>

        private static SqlParameter[] GetSpParameterSetInternal(SqlConnection connection, string spName, bool includeReturnValueParameter)

        {

            if (connection == null) throw new ArgumentNullException("connection");

            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");



            string hashKey = connection.ConnectionString + ":" + spName + (includeReturnValueParameter ? ":include ReturnValue Parameter" : "");



            SqlParameter[] cachedParameters;



            cachedParameters = paramCache[hashKey] as SqlParameter[];

            if (cachedParameters == null)

            {

                SqlParameter[] spParameters = DiscoverSpParameterSet(connection, spName, includeReturnValueParameter);

                paramCache[hashKey] = spParameters;

                cachedParameters = spParameters;

            }



            return CloneParameters(cachedParameters);

        }

        

        

        

     



        #endregion Parameter Discovery Functions



    }

}