Add a GIF or a text to an appointment. Select an option below and double click an appointment. Text at the beginning Text at the end GIF at the beginning GIF at the end Set a background 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.