RadControls for ASP.NET AJAX
The AppointmentCancelingEdit event occurs when the user clicks the cancel button of the in-line editor or the edit form.
AppointmentCancelingEdit has two parameters:
sender is the scheduler control.
e is an object of type AppointmentCancelingEditEventArgs. It has three properties:
Appointment is the appointment that was being inserted or updated by the editor.
Container is the editor that was being used to insert or edit an appointment.
Cancel is a boolean value that lets you prevent the user from exiting the edit form or in-line editor.