How to identify dropdownlist is postback or not in asp.net ?

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I have three dropdowns Country,state,city with autopostback=true and one show button .
when I am selecting country dropdown, page is also loading everytime
i want to ristrict pageloade while selecting the dropdownlilsts.

How it is possible in asp.net

Please give me Your valueble suggetions

Posted 23-Feb-13 0:15am

SRINIVASA RAO T

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Avik Ghosh22 23-Feb-13 6:25am

autopostback=FALSE;try this

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VivekSharma0925 · Answer 1 · 2013-02-23T00:30:00

Hi Srinivasa,

Since you are using autopostback, page is supposed to load.

I understand, you want to load the state on country selection and then on state selection you want to list the cities.

Do it like this.

Keep autopost back true on country and state and turn auto postback off on city.

1) Put all three control in a single row and all three should be in an AJAX UpdatePanel. You will require scriptmanager to run ajax. For any number of AJAXs, 1 scriptmanager should work.
2) On country selection, on postback event, list the states. Keep track that country dropdown is not cleared.
3) Then on State selection, retain country value, state value and populate cities.

Now, you have not told what show button is supposed to do, but i guess on show button click, you want to load some details or another page or whatever.

So I guess you can use above selected dropdown values now.

Keep coding.
Thanks.