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代码编辑器：

<!DOCTYPE html>
<meta charset="utf-8" />
<form runat="server">
<table>
<tr>
<td>
<table bgcolor="#b0c4de" cellspacing="10">
   <tr>
     <td align="right">Name:</td>
     <td><asp:TextBox id="txt_name" runat="server"/></td>
     <td>
     <asp:RequiredFieldValidator
     ControlToValidate="txt_name" 
     ErrorMessage="Name"
     Text="*" 
     runat="server"/>
     </td>
   </tr>
   <tr>
     <td align="right">Card Type:</td>
     <td>
     <asp:RadioButtonList id="rlist_type" 
     RepeatLayout="Flow"
     runat="server">
     <asp:ListItem>Diners</asp:ListItem>
     <asp:ListItem>MasterCard</asp:ListItem>
     <asp:ListItem>Visa</asp:ListItem>
     </asp:RadioButtonList>
     </td>
     <td>
     <asp:RequiredFieldValidator
     ControlToValidate="rlist_type"
     ErrorMessage="Card Type"
     InitialValue=""
     Text="*"
     runat="server"/>
     </td>
   </tr>
   <tr>
     <td></td>
     <td><asp:Button id="b1" Text="Submit" runat="server"/></td>
     <td></td>
   </tr>
</table>
</td>
</tr>
</table>
<br>
<asp:ValidationSummary
HeaderText="You must enter a value in the following fields:"
DisplayMode="BulletList"
EnableClientScript="true"
runat="server"/>
</form>

代码编辑器：

运行结果：