This post is move to http://devssolution.com/start-date-and-end-date-validation-in-asp-net/
simple person
Start Date and End Date validation in asp.net
Please check it and give your valuable suggestion.
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Devloper's solution 
this page not opening
Now it’s working fine
where is the solution it is nt available
Now it’s working please check it.
why cant we use in built .net comparevalidator control for this?
HI Pooja,
As per my thinking,we need to check validation in calender date selection event and give alert msg if date is not valid. so that’s why we haven’t use comparevalidator here.
Thanks for comment.
owh.. thank you so much dude. =)
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Anderson
Hey good post.. I wanted to implement such validation and while googling I reached here but I was not using ajax calendar. I was using jQuery UI Datepicker. I found a link too to do this validation using jQuery UI Datepicker. Thought of sharing with your readers.
http://jquerybyexample.blogspot.com/2012/01/end-date-should-not-be-greater-than.html
Thanks buddy.