Ajax Date Comparison

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C#

ASP.NET

I am using Ajax calendar extender, when i clicked on textbox, ajax calender will appears and when i click on a date, the date will appear in the textbox and calendar dissappears.

The question is, I want to validate that date, user can't select a date less than a particular date, more than a particular date



In detail:

I have two dates, FromDate and ToDate
FromDate must be less than ToDate, ToDate must be greater than FromDate etc


Kindly give me a solution to do this.