Dropdownlist and Gridview

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SQL-Server-2005

C#

ASP.NET

, +

hello Frnds,

On my webform i have dropdownlist and a gridview.

and am Loaded Data into Gridview. and when i select item from dropdown list it displays that particular records in gridview...everything is ok about selecting and displaying in gridview.

But the thing here is that, when i select item from dropdown list it displays correctly BUT after sometime it comes back to the starting page to ----Select-----


Please help me. am beginner.

Thanks,