Q:

Asp.net Ajax , Hangs Sometimes

I use ASP.net Ajax on my project. and using Session for state management.
in some piece of code , I have some modalpop up , that contain UCs and do some things.
If I use UpdatePanel , sometimes, when I open popup, for a long time progress bar shows and dont do any things. if I refresh page it will work correctly.
Also If I remove the UpdatePanel all methods work perfectly.
on pages that I have more than one popup( or any method that I run under update panel) I have this problem.
What was wrong? and how can I fix this?

A:

First thing you should do is get Fiddler and look for any outstanding requests.

