ValidatorCallout控件，該控件用於用戶控件中輸入不符合格式要求的內容之後，提示操作錯誤信息。
<%...@ Page Language="C#" AutoEventWireup="true" CodeFile="ValidatorCalloutDemo.ASPx.cs"
Inherits="ValidatorCalloutDemo" %>
<%...@ Register Assembly="System.Web.Extensions, Version=1.0.61025.0, Culture=neutral,
PublicKeyToken=31bf3856ad364e35"
Namespace="System.Web.UI" TagPrefix="ASP" %><%...@ Register Assembly="AjaxControlToolkit" Namespace="AJaxControlToolkit" TagPrefix="cc1" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHtml 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xHtml1-transitional.dtd"><html XMLns="http://www.w3.org/1999/xHtml" ><head runat="server"> <title>無標題頁</title></head><body> <form id="form1" runat="server"> <div> <ASP:ScriptManager ID="ScriptManager1" runat="server"> </ASP:ScriptManager> <table> <tr> <td>電子郵件:</td>]
<td><ASP:TextBox runat="server" ID="MailTextBox" Border
BorderWidth="1px" BorderColor="#a9a9a9" /></td> </tr> </table> <br /> <ASP:RegularExpressionValidator runat="server" ID="PNRegEx"
ControlToValidate="MailTextBox" Display="None" ErrorMessage="<b>格式不正確</b><br />請按如下格式填寫<br />[email protected]" ValidationExpression="w+([-+.'']w+)*@w+([-.]w+)*.w+([-.]w+)*" /> <ASP:Button ID="Button1" runat="server" Text="提交" /> <cc1:ValidatorCalloutExtender runat="Server" ID="PNReqE" TargetControlID="PNRegEx"
Width="100px" /> </div> </form></body></Html>
