Question 353. How To Control How Long An Ajax Request May Last?
Use the ScriptManager's AsyncPostBackTimeout Property. For example, if you want to debug a web page but you get an error that the page request has timed out, you may set <asp:scriptmanager id="ScriptManager1 " runat=" server" asyncpost backtimeout="9000 "></asp: script manager> where the value specified is in seconds.
