title: How to hide my menu for non authenticated users?
body: <p>I have authenticated users to log on my system using this code:</p>
  
  <pre><code>FormsAuthentication.SetAuthCookie(user, false);
  </code></pre>
  
  <p>I want to hide my system menu for non authenticated users. Something like this:</p>
  
  <pre><code>&lt;% if(???) {%&gt;
     &lt;ul id="menu&gt;
        ...
     &lt;/ul&gt;
  &lt;% } %&gt;
  </code></pre>
  
  <p>How can I do this?</p>
  
  <p>Thank you.</p>