agree with happybirds(happybirds) , use 2 Validators or write a custom validator, for example:Writing a Custom Validator Control in ASP.NET
http://www.dotnet247.com/247reference/a.aspx?u=http://www.c-sharpcorner.com/Code/2002/May/DateCustomValidator.asp
http://www.dotnet247.com/247reference/a.aspx?u=http://www.c-sharpcorner.com/Code/2002/May/DateCustomValidator.asp
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