Here Mudassar Ahmed Khan has explained with an example, how to implement jQuery AutoComplete TextBox inside GridView in ASP.Net using C# and VB.Net.

The jQuery AutoComplete Plugin is applied to all the TextBoxes and the data for the jQuery AutoComplete TextBox will be populated from the SQL Server database in ASP.Net using C# and VB.Net.

Here Mudassar Ahmed Khan has explained with an example, how to display AJAX ModalPopupExtender Modal Popup inside RowCommand event of GridView in ASP.Net using C# and VB.Net.

Inside the GridView OnRowCommand event handler, the GridView Selected Row details will be fetched and displayed in the ASP.Net AJAX ModalPopupExtender Modal Popup.

Here Mudassar Ahmed Khan has explained with an example, how to check for duplicate values while inserting in GridView without SQL in ASP.Net using C# and VB.Net.

When the Add Button is clicked, the values of TextBoxes will be compared with the Row values of the GridView using ASP.Net CustomValidator and JavaScript and if the values are duplicate, error messages will be displayed.

Here Mudassar Ahmed Khan has explained how to make solve the problem of ValidateRequest = 'false' not working in .Net 4.0 and 4.5 in ASP.Net.

ValidateRequest = 'false' is used to supress the exception: A potentially dangerous Request.Form value was detected from the client in ASP.Net and allow posting scripts and HTML content in ASP.Net.

The ValidateRequest property is a .Net 2.0 and .Net 3.5 property and hence in order to work on .Net 4.0 and .Net 4.5 an additional property is needed.