Disabled dates are the ones that appear disabled and are not selectable at run-time. You can add disabled dates at design-time through DateTime Collection Editor. You can also add disabled dates through code in CalendarView by setting the DisabledDates property to a DateTime array. (A DateTime constructor represents an instant in time, expressed typically as a date and time of the day.)

The following image shows disabled dates in CalendarView.

The following code snippet shows how to add disabled dates using the DisabledDates property in CalendarView:

// Set disabled dates
calendarView.DisabledDates = new DateTime[]
            {               
    new DateTime(2021, 05, 16),
    new DateTime(2021, 05, 17),
    new DateTime(2021, 05, 18),
    new DateTime(2021, 05, 19),
    new DateTime(2021, 05, 20),
    new DateTime(2021, 05, 21),
    new DateTime(2021, 05, 22)
            };