DropdownList onchange trigers reloading of the page not as postback.

[Alex Gurevich]

Hi,

I am having very strange problem,
I have Dropdownlist (DDL) with callback function for SelectedIndexChanged
event on asp.net page, which is populated in codebehind Page_OnLoad page.
After postback of the page, througth on click event of a button on the page,
and returning of the page to client side, usually selection of an item in
the DDL trigers reloading of the page but not as a postback.
Afterwads if you select another item in DDL everything works fine i.e. page
postbacked as it should.

Any help will be really appreciated.

 

[Alex Gurevich]

Fascinating discovery,
I launch two windows from the same parent window and both contains iframe
with problematic aspx page.
If I launch only one of them, it works fine. As soon as I launch second page
the first one submits the page but on the server it arrives as first time
request and not as a postback.