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Jun 15, 2010 05:04 PM|LINK
I just spent about two hours working on this same problem...
What I found was when the listitems were generated through a loop in the codebehind file and I didn't explicitly set one to SELECTED, the SelectedIndexChanged event never fires.
When I add a default value (either through the markup or in the codebehind), this works fine. I wouldn't expect this kind of behavior - I assumed (until now) index 0 would be the default if no option was selected...
drop down dropdownlist autopostback