使用CompareValidator控件来验证出生年月,但是本人在初次编写时是在Page_Load()中写
CompareValidator1.ValueToCompare = DateTime.Today.ToShortDateString();

<asp:CompareValidator   id="CompareValidator1"   style="Z-INDEX:   118;   LEFT:   280px;   POSITION:   absolute;   TOP:   320px"   ValueToCompare='<%#   DateTime.Today.ToShortDateString()   %>'   ControlToValidate="txtBirthDate"   Operator="LessThan"   Type="Date"   Text="*"  
  runat="server"   ErrorMessage="填写出生信息有误!"></asp:CompareValidator>

另外,

//服务器端CustomValidator的简单编写,只要定义ErrorMessage属性与绑定控件,及设置ServerValidate事件即可

protected void CustomValidator2_ServerValidate(object source, ServerValidateEventArgs args)
    {
        if (args.Value == "服务器")
        {
            args.IsValid = true;
        }
        else
        {
            args.IsValid = false;
        }
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        if (IsValid)
        {
            Label1.Text = "您注册成功,请妥善保管您的注册信息!";
        }
        else
        {
            Label1.Text = "您的注册信息填写有误,请及时修改!";
        }
    }

//客户机端CustomValidator的简单编写,要定义ErrorMessage属性与绑定控件,及设置ClientValidationFunction属性为以下自定义的JS方法

<script language="javascript" type="text/javascript">
        function validateClient(sender,e)
        {
            if(e.Value == "客户端")
            {
                e.IsValid = true;
            }else
            {
                e.IsValid = false;
            {
        }
    </script>

注意:CustomValidator控件默认是可以为输入空字符通过的,若要禁止空字符串验证通过,可加入RequiredFieldValidator控件.

另外这些验证控件的Display属性成Dynamic就会在页面上自动调整位置,而Static固定大小,相当于Div与Span关系.:)