AJAX和WebService实现邮箱验证(无刷新验证邮件地址是否合法)

html xmlns="http://www.w3.org/1999/xhtml">
head runat="server">
title>/title>
/head>
body>
form id="form1" runat="server">
asp:ScriptManager ID="ScriptManager1" runat="server">
/asp:ScriptManager>
asp:UpdatePanel ID="UpdatePanel1" runat="server">
ContentTemplate>
div>
Emailasp:TextBox ID="txtemail" runat="server">/asp:TextBox>asp:Label ID="lblinfo"
runat="server" Text="">/asp:Label>
br />
br />
asp:Button ID="Button1" runat="server" Text="调用" onclick="Button1_Click" />
/div>
/ContentTemplate>
/asp:UpdatePanel>
/form>
/body>
/html>

protected void Button1_Click(object sender, EventArgs e)
{
WebEmail.ValidateEmailWebService webemail = new WebEmail.ValidateEmailWebService();
byte result = webemail.ValidateEmailAddress(txtemail.Text);
if (result == 0)
{
lblinfo.Text = "请重新验证";
}
else if (result == 1)
{
lblinfo.Text = "邮件地址合法";
}
else if (result == 2)
{
lblinfo.Text = "只是域名正确";
}
else if (result == 3)
{
lblinfo.Text = "一个未知错误";
}
else if (result == 4)
{
lblinfo.Text = "邮件服务器没有找到";
}
else if (result == 5)
{
lblinfo.Text = "电子邮件地址错误";
}
else if (result == 6)
{
lblinfo.Text = "免费用户验证超过数量（50次/24小时）";
}
else if (result == 7)
{
lblinfo.Text = "商业用户不能通过验证";
}
}