title: Getting hidden control of parent from iFramed code-behind
body: <p>In my parent page I have a hidden control:</p>
  
  <pre><code>&lt;input type="hidden" id="CaseID" value="" runat="server" /&gt;
  </code></pre>
  
  <p>I need for my page in the iFrame to be able to get this value from C# code-behind.  I have so far been unsuccessful.</p>
  
  <p>In the child page's code-behind I have tried variations of this:</p>
  
  <pre><code>var theParent = this.Page.Parent;
  </code></pre>
  
  <p>But I always get null back.</p>
  
  <p>Any assistance would be greatly appreciated.</p>