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代码编辑器：

<!DOCTYPE html>
<meta charset="utf-8" />

<form runat="server">
<table border="0" bgcolor="#b0c4de">
   <tr valign="top">
     <td colspan="4"><h4>Compare two values</h4></td>
   </tr> 
   <tr valign="top">
     <td><asp:TextBox id="txt1" runat="server" /></td>
     <td>
     <asp:ListBox id="list" rows="2" OnSelectedIndexChanged="check_operator" runat="server">
           <asp:ListItem value="Equal" selected>=</asp:ListItem>
           <asp:ListItem value="NotEqual"><></asp:ListItem>
     </asp:ListBox>
     </td>
     <td><asp:TextBox id="txt2" runat="server" /></td>
     <td><asp:Button Text="Validate" runat="server" /></td>
   </tr>
</table>
<br>
<asp:CompareValidator
id="compval" 
Display="dynamic"
ControlToValidate="txt1" 
ControlToCompare="txt2" 
ForeColor="red" 
BackColor="yellow" 
Type="String"
EnableClientScript="false" 
Text="Validation Failed!" 
runat="server" />
</form>

代码编辑器：

运行结果：