Clear Selected Date Of Asp.Net Ajax Calendarextender Using Javascript

http://aspsnippets.com/Articles/Clear-Selected-Date-of-ASPNet-AJAX-CalendarExtender-using-JavaScript.aspx

Enabling Client Side Validation on Custom Data Annotations with IClientValidatable in MVC

http://www.itorian.com/2013/08/enabling-client-side-validation-on.html