CompareValidator error message

how can I automatically set ErrorMessage text to whatever is in the ValueToCompare?
a bit like Please enter a date less than {0} type of thing?

I change ValueToCompare in code-behind, does ErrorMessage need changed in code-behind too or can I use something like {0} ?



            <asp:CompareValidator
                ID="dateValidator" runat="server"
                Type="Date"
                ValueToCompare="30/11/2013"
                Operator="LessThanEqual"
                ControlToValidate="txtDateEnd"
                ErrorMessage="Please enter a date less than 30/11/2013 "></asp:CompareValidator>