When using the asp:UpdatePanel server control for asyncronous communication with the web server the default timeout is 90 seconds. For some processes this may not be long enough.
For example, I am currently working on a reporting application and at the moment I have to query a table with over 36 million records. Some queries take longer than 90 seconds. But unfortunately I had trouble finding out how to extend this.
It turns out that this is a page-level setting. The asp:ScriptManager server control has a property namedAsyncPostBackTimeout. Set this value to the number of seconds you need to resonably run the process in question and you'll be fine.
<asp:scriptmanager id="scriptManager1" runat="server" enablepartialrendering="true" asyncpostbacktimeout="1000"></asp:ScriptManager>
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