Use the ClearNonworkingDates method to remove all nonworking dates. Use the ShowNonworkingDates property to show or hide the nonworking dates. Use the RemoveNonworkingDate method to unmark a specified nonworking date, being previously added using the AddNonworkingDate method. Use the IsDateVisible property to specify whether a date fits the chart's area. Use the IsNonworkingDate property to check whether the date is already highlighted as nonworking day. The NonworkingDays property specifies the days being marked as nonworking in a week. 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.