Expired session on a website using callbacks
<p>I have an aspx.cs page that use only callback to connect to server side.</p>

<p>After the website starts running, if I work on this page for several minutes, the session has been expired. I have only used callback and I haven't used any postback.
I think the session has expired because it's not arising from the postback, but my web site is callback based and I never use postback.</p>

<p>How can I resolve this expired session problem?</p>
