Required field validator not working on specific page
<p>Below is the code. Validation summary is never displayed.I trie to add validation group but no help.</p>

<pre><code>&lt;td style="text-align: left"&gt;
  &lt;asp:TextBox ID="txtccnum" runat="server" Width="100%"&gt;&lt;/asp:TextBox&gt;
&lt;/td&gt;
&lt;td style="text-align: left"&gt;
  &lt;asp:RequiredFieldValidator ID="RequiredFieldValidator12" runat="server"
    ControlToValidate="txtccnum" ErrorMessage="Credit Card # Cannot be empty"&gt;*
  &lt;/asp:RequiredFieldValidator&gt;
&lt;/td&gt;
&lt;asp:ValidationSummary ID="ValidationSummary2" runat="server" ShowMessageBox="True"
    ShowSummary="False" DisplayMode="BulletList" Width="700px" /&gt;
&lt;asp:Button ID="btnapply" Text="NEXT" runat="server" OnClick="btnapply_Click" /&gt;
</code></pre>
