I have a textbox where the user enters date. The textbox can only accept dates betweeen 3/17/08 and 06/16/08. If the user enters date before 3/17/08 and after 06/16/08, then I would have to show an error message. This textbox is not a required field and can be left blank. But if the date the user enters is not within the specified dates, then I will have to show them an error. Thanks in advance.