Primero en el toolbox seleccionamos el control "scriptmanager"
<asp:MaskedEditExtender ID="MaskedEditExtender1" runat="server"
TargetControlID="TextBox1"
Mask="99/99/9999"
MessageValidatorTip="true"
OnFocusCssClass="MaskedEditFocus"
OnInvalidCssClass="MaskedEditError"
MaskType="Date"
DisplayMoney="Left"
AcceptNegative="Left"
ErrorTooltipEnabled="True">
</asp:MaskedEditExtender>
<asp:CalendarExtender ID="CalendarExtender1"
runat="server"
TargetControlID="TextBox1"
PopupButtonID="ImageButton1">
</asp:CalendarExtender>
<asp:TextBox ID="TextBox1"
runat="server"
ValidationGroup="MKE"></asp:TextBox>
<asp:ImageButton ID="ImageButton1"
runat="server"
ImageUrl="~/images/Calendar_scheduleHS.png"
CausesValidation="False"
/>
<asp:MaskedEditValidator
ID="MaskedEditValidator1"
runat="server"
ControlExtender="MaskedEditExtender1"
ControlToValidate="TextBox1"
EmptyValueMessage="Date
is required"
InvalidValueMessage="Date
is invalid"
Display="Dynamic"
TooltipMessage="Input a
date"
EmptyValueBlurredText="*"
InvalidValueBlurredMessage="*"
ValidationGroup="MKE"
>
</asp:MaskedEditValidator>

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