title: ASP.NET: Session.SessionID changes between requests
body: <p>Why does the property <strong>SessionID</strong> on the <strong>Session</strong>-object in an ASP.NET-page change between requests?</p>
  
  <p>I have a page like this:</p>
  
  <pre><code>...
  &lt;div&gt;
      SessionID: &lt;%= SessionID %&gt;
  &lt;/div&gt;
  ...
  </code></pre>
  
  <p>And the output keeps changing every time I hit F5, independent of browser.</p>