title: Session_End doesn't call after i close browser
body: <p>I use below setting in web.config</p>
  
  <pre><code>&lt;sessionState mode="InProc" cookieless="false" timeout="10"/&gt;
  </code></pre>
  
  <p>...</p>
  
  <pre><code>&lt;authentication mode="Forms"&gt;
  &lt;forms loginUrl="login.aspx" timeout="10"/&gt;
  </code></pre>
  
  <p>and in <code>Session_End</code> according to Session's value i change a column's value in database (if this column's value is 1 means user online) but sometimes after a day that user close browser this column's value steel is 1 (means Session_End doesn't call after user close browser)</p>