c# asp.net RangeValidator（范围验证）控件（11）

form id= "form1" runat= "server">
        <div style= "text-align:center">验证范围控件
        <hr style= "width:50%"/>
        旅游登记信息<br />
         客户编号：
         <asp:TextBox ID= "num_id" runat= "server" BackColor= "White"></asp:TextBox>
         <asp:RangeValidator ID= "RangeValidator1" runat= "server" ErrorMessage= "编号为1~1000之间"
            ControlToValidate= "num_id" MaximumValue= "1000" MinimumValue= "1" Type= "Integer"></asp:RangeValidator><br />
            旅游日期：
            <asp:TextBox ID= "travel_date" runat= "server"></asp:TextBox>
            <asp:RangeValidator    runat= "server" ID= "RangeValidator2" ErrorMessage= "旅游日期为2个月内" 
            ControlToValidate= "travel_date" Type= "Date">
            </asp:RangeValidator><br/>
            <asp:Button ID= "Button1" runat= "server" Text= "提交" OnClick= "button_Click" /><br />
            <asp:Label ID= "Label1" runat= "server" Width= "353px" ForeColor= "Red"></asp:Label>
        </div>
        </form>

  protected  void Page_Load( object sender, EventArgs e)
                {
                        RangeValidator2.MinimumValue = DateTime.Now.ToShortDateString();
                        RangeValidator2.MaximumValue = DateTime.Now.AddMonths(2).ToShortDateString(); //这里是学习的重点，addmonths（）为从目前加上几个月为止，也可以是年
                }

                 protected  void button_Click( object sender, EventArgs e)
                {
                         //验证提示
                         if (Page.IsValid) 
                        Label1.Text =  "验证成功";
                }