title: Validation summary control not showing message?
body: <p>I have a page with TextBox to enter a Mobile Number.
  For that I have validated it using RequiredFieldValidator and RegularExpressionValidator
  with display=none:</p>
  
  <p>And also I have placed a ValidationSummary Control </p>
  
  <pre><code>&lt;asp:ValidationSummary ValidationGroup="mobile" ShowSummary="false" ID="vsValid"
      runat="server" ShowMessageBox="true" Enabled="true" 
      DisplayMode="SingleParagraph" /&gt;
  &lt;asp:TextBox ID="txtMobileNumber" runat="server" CssClass="Qinputbox"&gt;&lt;/asp:TextBox&gt;
  &lt;asp:RequiredFieldValidator Display="None" ControlToValidate="txtMobileNumber" 
      ID="reqValidMobileNo" runat="server" ErrorMessage="*" 
      ValidationGroup="mobile"&gt;&lt;/asp:RequiredFieldValidator&gt;
  &lt;asp:RegularExpressionValidator ControlToValidate="txtMobileNumber" Display="None"
      ID="regExValidMobileNo" runat="server" 
      ErrorMessage="Please enter a valid mobile number."
      ValidationExpression="^((\+){0,1}91(\s){0,1}(\-){0,1}(\s){0,1}){0,1}9[0-9]
          (\s){0,1}(\-){0,1}(\s){0,1}[1-9]{1}[0-9]{7}$"
      ValidationGroup="mobile"&gt;&lt;/asp:RegularExpressionValidator&gt;
  </code></pre>
  
  <p>when I entered characters in the TextBox it is not showing the summary.
  What might be the problem?</p>