Sys.WebForms.PageRequestManagerTimeoutException - The server request timed out

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Dear friends , above error will be shows in different cases .
I faced same issue regarding server timeout with ASP.NET loader event.

Error & Cause :
I got this error: "Sys.WebForms.PageRequestManagerTimeoutException The server request timed out" from the Ajax Extension framework. Its occurred because the export operation was relatively long (something like 2 minutes) and the Ajax Extension Callback framework had a timeout.


How to solve this problem?

 To solve this problem we can increase the timeout. You can change the timeout time by adding a new property to the script manager control. This property is called AsyncPostBackTimeOut and it can help us to define the number of seconds before the request will throw a request timeout exception*.
For example if you want that the timeout will take maximum 10 minutes your code should be look like this:
<asp:ScriptManager ID="ScriptManager1" runat="server"
AsyncPostBackTimeOut="600" >
</asp:ScriptManager>     

* The default value of the AsyncPostBackTimeOut property is 90 seconds.



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