Masked edit validator and extender demo

<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
       
        <cc1:MaskedEditValidator
         ID="MaskedEditValidator1"
         runat="server"
          ControlToValidate="TextBox1"
           EmptyValueMessage="Please enter Date of Birth"
           InvalidValueMessage="Date is Invalid"
           ControlExtender="MaskedEditExtender1"
           IsValidEmpty="False"
            TooltipMessage="Date is invalid"
             Display="Dynamic"/>
        <cc1:MaskedEditExtender
        ID="MaskedEditExtender1"
         runat="server"
          Mask='99/99/9999'
          MaskType="Date"
           TargetControlID="TextBox1"
           PromptCharacter="_" />