title: Find sibling control in Repeater
body: <p>I have a <code>Repeater</code> structured something like this:</p>
  
  <pre><code>&lt;asp:Repeater ID="rptListClaimTypes" runat="server"&gt;
      &lt;ItemTemplate&gt;
          &lt;asp:FileUpload ID="fuContract" runat="server" /&gt;
          &lt;asp:LinkButton ID="btnUpload" runat="server" Text="Upload" OnClick="btnUpload_Click" CommandName='&lt;%# Eval("ClaimTypeID")%&gt;' /&gt;
      &lt;/ItemTemplate&gt;
  &lt;/asp:Repeater&gt;
  </code></pre>
  
  <p>I need to handle the file upload when <code>btnUpload</code> is clicked. I can access the control that triggered the subroutine with <code>sender</code>. How would I access <code>fuContract</code>?</p>
  
  <pre><code>Protected Sub btnUpload_Click(sender As Object, e As EventArgs)
  
      Dim ClaimTypeID As Integer = sender.CommandName
      Dim fuContract As FileUpload = '??
  
  End Sub
  </code></pre>