[DotNetDevelopment] AutoPostBack = "false" nd OnSelectedIndexChanged are not working properly together

[Priyanka]

i m making in application in which user fill some entries, and go to
next page on click event and after filling enteries on next page now
he wants to change the data of previous page..
for this i have Setthe AUTOPOSTBACK property to false of previous
page's control. and it s working fine..
bt wen i set AutoPostBack = "false" on dropdown list then
OnSelectedIndexChanged event is not working..
can anybody help me out??