how to make retain data in dropdownlist?

shivani 2013 asked:

I have one form containing dropdownlist with 4 values in it fetching from database and have one button.
now on page load i have written coding for fetching data in dropdownlist and i am getting that and i select one value from it but when i click on button for "additional functionality" on it then dropdownlist also get refreshed(the value i selected is replaced by first value in dropdownlist...i tried of autopostback on button and too on dropdownlist but had no affect
.how can i stop this
pls tell
regards

Tags: C# (C# 4.0), .NET (.NET 3.5), ASP.NET

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