title: Show a page in VB you are not authorized
body: <p>I have following function:</p>
  
  <p>in a.aspx.vb page:</p>
  
  <pre><code>If  a = True Then
      'do something
  Else
      'i want to show a not authorized page here
  End If
  </code></pre>
  
  <p>Will i have to create a new page and give the url under else to show not authorized page? 
  Or is there any other pre-built way to do this in .net 4.0?</p>