Use the ShowNonworkingDates property to stop highlighting the nonworking dates. The NonworkingDays property specifies the days being marked as nonworking in a week. Use the AddNonworkingDate method to add custom dates as being nonworking days. Use the IsNonworkingDate property to specify whether the date is a nonworking day. Use the NonworkingDaysPattern property to specify the pattern being used to fill non-working days. The NonworkingDaysColor property specifies the color being used to fill the non-working days. Use the ClearNonworkingDates method to remove all nonworking dates.