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>
rwallacejAsked:
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Paul JacksonConnect With a Mentor Software EngineerCommented:
I think the only way to do this will be to update the errormessage from the code behind at the same time as you update the ValueToCompare that will ensure consistency and is the only way possible afaik.

Does the date have any relevance is it always today's date or end of month date?

If it is todays date then there may be a way to do it in the markup or you could just change the message to be more generic such as 'Please enter a date before today' or 'Please enter a date before month end'.
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rwallacejAuthor Commented:
Does the date have any relevance is it always today's date or end of month date?
- no
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rwallacejAuthor Commented:
Wrote code to set the values in code behind as can't be automated
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