Calendar is an integrated Calendar / Schedule control, supporting a wide variety of date and date range selection types, day customization. The calendar is compact and fast. It is also self-updating on the client side and has an option to select days. Control has AJAX behavior - it may loads collection of special dates only after selecting next or previous month or year, not during page rendering - it decreases traffic. Setting a range of dates is available. Auto localization depending on application culture settings. ASP.NET AJAX supports and rich client side API.