I am new to ASP.NET 4.0 and the whole Object Oriented Programming. I added a Calendar Extender on a text box. Now I would like it to be formatted to MM/DD/YY, PLUS, I also want to validate if the date entered is more than let's say 90 days from today. If it is more than 90 days, I would like to show something like an error message and set the focus on the date field. I am writting my code in C#. Can any body help on this?
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