title: Page.PreviousPage.FindControl is NULL
body: <p>I am accessing Test.aspx through two different pages. Something like this:</p>
  
  <p><strong>Page1.aspx -------> Test.aspx &lt;-------- Page2.aspx</strong></p>
  
  <p>I am testing this in IE7 where <code>Request.UrlReferrer.AbsoluteUri</code> is not working. In IE 8+ it works. Nothing I tried is working so far and its driving me <strong>nuts</strong>.</p>
  
  <p>I also tried putting a hidden textbox in Page1.aspx so that I can see if the control textbox is available, if it is then I know I am coming from Page1 or else Page2. This code is not working:</p>
  
  <pre><code>        var hidden = Page.PreviousPage.FindControl("tbhidden");
  </code></pre>
  
  <p>'tbhidden' is this:  <code>&lt;asp:textbox ID="tbhidden" runat="server" visible = "false"/&gt;</code></p>
  
  <p>How would you crack this problem? </p>