/Visual Studio 2008/VBWinFormDataGridView/JustInTimeDataLoading/ReadMe.txt

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       WINDOWS FORMS APPLICATION : VBWinFormDataGridView Project Overview

       

                   JustInTimeDataLoading Sample

                        

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Use:



 This sample demonstrates how to use virtual mode in the DataGridView control 

 with a data cache that loads data from a server only when it is needed. 

 This kind of data loading is called "Just-in-time data loading". 





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Remark:



 If you are working with a very large table in a remote database, for example, 

 you might want to avoid startup delays by retrieving only the data that is 

 necessary for display and retrieving additional data only when the user scrolls 

 new rows into view. If the client computers running your application have a 

 limited amount of memory available for storing data, you might also want to 

 discard unused data when retrieving new values from the database.





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Code Logic:



1.  Enable VirtualMode on the DataGridView control by setting the VirtualMode

    property to true:

    

    Me.dataGridView1.VirtualMode = true;

                        

2.  Add columns to the DataGridView according to the data in the database;



3.  Retrieve the row count of the data in the database and set the RowCount 

    property for the DataGridView;

    

4.  Handle the CellValueNeeded event to retrieve the requested cell value 

    from the data store or the Customer object currently in edit. 





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References:



1. Implementing Virtual Mode with Just-In-Time Data Loading in the Windows 

   Forms DataGridView Control

   http://msdn.microsoft.com/en-us/library/ms171624.aspx

   

2. Windows Forms FAQs

   http://windowsclient.net/blogs/faqs/archive/tags/Custom+Designers/default.aspx





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