How To Handle A Postback After Session Expires On Site

Mar 18, 2011

I have a simple ASP.NET 4 site. I am using Forms Authentication. I have Session timeout set to 20 minutes. Also when the user authenticates I set the AuthenticationTicket to expire in 20 minutes. So normally everything works fine. If there is more than 20 minutes of inactivity and the user requests a page on the site they are redirected back to the Login page as I would expect.

However, let's say that the user is on a page that contains a form. Then they wait 25 minutes. Then they go to submit the form. Instead of being redirected back to the Login page, the site attempts the postback and I immediately get errors because there is code in the postback that attempts to get information out of Session.

It seems like ASP.NET does not redirect back to Login on postback if the AuthenticationTicket and Session has expired. How can I handle this? I hope I don't have to write special code on each page.

ADDED: web.config code

<location path="ForgotLogin.aspx">
<allow users="*" />
<authentication mode="Forms">
<forms loginUrl="~/Login.aspx"></forms>
<deny users="?" />

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