An example how to use an event to prevent a user from entering a value longer than 30 characters into an appointment. event: DailyCalendar.AppointmentEdit Edit any appointment's text.

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If you would look into a source code for this demo, click on the link.
For demonstration purposes all appointments displayed on a calendar are stored in ASP.NET session objects, so original values are restored immediately after a new session object is created.
A list of appointments and resources is intialized every time a new session is started.