给你一个例子看看吧。
<%@ Page Language="C#" %>
<HTML>
<HEAD>
</HEAD>
<body>
<h3>ValidationSummary Sample</h3>
<p>
<form runat="server" ID="Form1">
<table cellpadding="10">
<tr>
<td>
<table bgcolor="#eeeeee" cellpadding="10">
<tr>
<td colspan="3">
<b>Credit Card Information</b>
</td>
</tr>
<tr>
<td align="right">
Card Type:
</td>
<td>
<asp:RadioButtonList id="RadioButtonList1" RepeatLayout="Flow" runat="server">
<asp:ListItem>MasterCard</asp:ListItem>
<asp:ListItem>Visa</asp:ListItem>
</asp:RadioButtonList>
</td>
<td align="middle" rowspan="1">
<asp:RequiredFieldValidator id="RequiredFieldValidator1" ControlToValidate="RadioButtonList1" ErrorMessage="Card Type. " Display="Static" InitialValue="" Width="100%" runat="server">
*
</asp:RequiredFieldValidator>
</td>
</tr>
<tr>
<td align="right">
Card Number:
</td>
<td>
<asp:TextBox id="TextBox1" runat="server" />
</td>
<td>
<asp:RequiredFieldValidator id="RequiredFieldValidator2" ControlToValidate="TextBox1" ErrorMessage="Card Number. " Display="Static" Width="100%" runat="server">
*
</asp:RequiredFieldValidator>
</td>
</tr>
<tr>
<td></td>
<td>
<asp:Button id="Button1" text="Validate" runat="server" />
</td>
<td></td>
</tr>
</table>
</td>
<td valign="top">
<table cellpadding="20">
<tr>
<td>
<asp:ValidationSummary id="valSum" DisplayMode="BulletList" ShowMessageBox="true" ShowSummary="false"
runat="server" HeaderText="You must enter a value in the following fields:" Font-Name="verdana" Font-Size="12" />
</td>
</tr>
</table>
</td>
</tr>
</table>
</form>
</p>
</body>
</HTML>
