/App_Code/Logs.cs

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.IO;

using System.Configuration;



public class Logs

    {

    

        public static void Write(string Msg)

        {

            try

            {

                System.Web.UI.Page page = new System.Web.UI.Page();

                string FileName =page.Server.MapPath("App_Data/Logs.log");

                string NewFileName =page.Server.MapPath("App_Data/LogsBak.log");

                int MaxLogsLines = 1000;

                int NoOfLine = 0;

                if (File.Exists(FileName))

                {

                    StreamReader sr = new StreamReader(FileName);

                    while (sr.ReadLine() != null)

                    {

                        NoOfLine = NoOfLine + 1;

                    }

                    sr.Close();





                }



                StreamWriter sw = new StreamWriter(FileName, true);



                if (NoOfLine < Convert.ToInt16(MaxLogsLines))

                {

                    sw.WriteLine(DateTime.Now.ToString() + "--" + Msg);

                    sw.Flush();

                    sw.Close();



                }

                else

                {

                    sw.WriteLine(DateTime.Now.ToString() + "--" + Msg);

                    sw.Flush();

                    sw.Close();

                    if (File.Exists(NewFileName))

                    {

                        File.Delete(NewFileName);

                    }

                    File.Move(FileName,NewFileName);



                }

            }

            catch (Exception)

            {

                

            }



        }

    }