I am using several update panels on 1 page. My question is if I am updating, editing, deleting with async postbacks, does the user's session get updated with aysnc postbacks or do I need a full postback to update the session variable? I have the session set to 60 minutes in the web.config file and it seems like their session is being lost rather quickly. Any suggestions?

 Thanks for your help,

The updatepanel uses XMLHTTPRequest to get the html to display in the panel. XMLHTTPRequest will send the session cookie, but on response it does not read and update the browser's session cookie, so after 20 mins the session cookie times out (in the browser) and is no longer sent to
the server.
 
you can switch to cookieless sessions or update the browser cookie using a server request via an img or iframe.
-- bruce (sqlwork.com)