Hello,

I have a gridview in an update panel. What I want to do is to be able to know when UpdatePanel is no longer updating the GridView with new information so I can use that as a signal that my process is finished.

Any advice on this appreciated, thanks!
 

For AJAX its has one Control that help user to understand process its done 

use UpdateProgress Control put in UpdatePanel so if your Gridview still updating UpdateProgress will show if finish its will disappear

this video how to make UpdateProgress work http://www.asp.net/learn/ajax-videos/video-123.aspx

Hope can Help you