Select one of calendar's resolutions: Calendar.HoursResolutions 5 min 6 min 10 min 15 min 20 min 1/2 hour 1 hour

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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.