How to: Display Specific Days in Bold with the Windows Forms MonthCalendar Control
The Windows Forms MonthCalendar control can display days in bold type, either as singular dates or on a repeating basis. You might do this to draw attention to special dates, such as holidays and weekends.
Three properties control this feature. The BoldedDates property contains single dates. The AnnuallyBoldedDates property contains dates that appear in bold every year. The MonthlyBoldedDates property contains dates that appear in bold every month. Each of these properties contains an array of DateTime objects. To add or remove a date from one of these lists, you must add or remove a DateTime object.
To make a date appear in bold type
To make a date appear in the regular font
Update the appearance of the font by calling the UpdateBoldedDates method.