how to timeout the client session in asp.net
<p>I'm looking to include a behavior in the base page that, when the session times out (after say 20 min), makes a call back to the client, erases the session cookie, and redirects the user to a "your session has timed out" page.</p>

<p>Before I start coding, I was wondering if there's a functionality in the framework that already handles this.</p>

<p>Thanks.</p>
