RadCalendar does not support selecting months. The supported selection mode allows for selecting all days in the calendar view area. This selection can be triggered by the help of a button at the top-left corner of the calendar (by default, its text is "x"). In order to show this button, you should set:
this.radCalendar1.ShowViewSelector = true;
You also need to allow this button to work and allow multiple cell selection:
this.radCalendar1.AllowViewSelector = true;
this.radCalendar1.AllowMultipleSelect = true;
Let me know if you have additional questions.
Regards,
Nikolay
Telerik
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