Selected index change Event in ddl is not firing

Dear Deepika,

I can see there is no item in your dropdown. If this is the case, then you would not be able to make selection and no index will be changed, hence selected index changed event is not firing (even there is 'AutoPostBack' property having 'true' value).

If this dropdown has values, they could be -
1) Static
2) Dynamic

Please send us entire code set to analyse more if items are available.

Thanks,
Bhasker