Dropdownlist selectedindexchanged

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C#

Hi,

Please help me with my dropdownlist

In my asp.net app having two dropdownlists, for dropdownlist1 I'm filling data during page_load event but dropdownlist2 need to fill by passing dropdownlist1's selected value to database to fetch data.

Problem: I dont want to pass control to server on every selection of dropdownlist1, I can achive this in windows app by getting dataset in form load event and on selection change of DP1 I can fill DP2 but how can I achive this in asp.net

thanks in advance...