GridView RowDatabound Event

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C#

SQL

ASP.NET4

Sir

I'm using Gridview With Template fields. I have taken item template and Edit item template fields.

On edit button click gridview is opening in edit mode but the problem is that value of the control is not showing. Means if Im using drop downlist it should display previous value and then i should update that value. But when I'm clicking edit the dropdown value is "--Select--" not the previously entered value.

How to use gridview rowdatabound with edit command for textbox control its proper but for checkbox,radiobutton,dropdown,checkboxlist,radiobuttonlist its not proper How can i do this?

please help thanks in advance