why the session is out unexpectedly in asp.net?
<p>I have a asp.net website, which use MVC 1.0 framework, but I found sometimes it will lost the current session unexpectedly, but I can not find the cause of this problem .</p>

<p>Do anyone have any suggestions ? or tell me how can find the reason of this issue,</p>

<p>Thanks in advance !</p>
