how to work drop down list without render page

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C#

ASP.NET

Dear Friend,

I have one problem when implimentes project.Their are two drop down list names as state and district.
i filled all the data related as state and district.

First time i did select state as maharastra then render page and give district names of maharashtra on district drop down list.

i completed my first form.Then i select another state just like gujarat state drop down list autopostback then gives names of gujarat district names.This information also saves on database.Now starting problem here if i am select second time maharashtra i dont want to autopostback this dropdown and i want to all district names of maharashtra.

How did get names of district when second time i choosed same name of state without render or autopostback events.

please solve this problem as soon as possible.