This enumeration is used to set the Calendar.NextPrevFormat property. It determines the appearance of the navigation controls that allow the user to move from month to month. ShortMonth will display an abbreviated month name on the previous and next month controls (like "Jan"), while FullMonth will display the full name of the month. If you use CustomText, you must set the corresponding Calendar.NextMonthText and Calendar.PrevMonthText programmatically (typically, in the Calendar.VisibleMonthChanged event handler).