ASP.NET session expires in Ajax request?

You could implement a KeepAlive SessionObserver (JavaScript) and track session timeouts yourself. That way you can trap SessionTimeouts of idle users, redirect them with a message and other useful things.

I am not sure if I understand your question correctly. You said, "update the session timeout in AJAX request". Normally, you don't need to do it explicitly.

Even though the request is an AJAX request, the Page Life Cycle doesn't change a bit. The modules/handlers will work the same way as they should. Hence, your session related information will automatically get updated.

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