RadCalendar c = new RadCalendar(); c.FirstDayOfWeek = null;See the method (RadCalendar.):
private static bool IsValidFirstDayOfWeek(object value) { DayOfWeek? nullable = (DayOfWeek?) value; return (Enum.IsDefined(typeof(DayOfWeek), nullable) || !nullable.HasValue); // ??? }I getting "throw ArgumentNullException: Value cannot be null.Parameter name: value"
Maybe code change to:
private static bool IsValidFirstDayOfWeek(object value) { DayOfWeek? nullable = (DayOfWeek?) value; return (!nullable.HasValue || Enum.IsDefined(typeof(DayOfWeek), nullable.Value)); }Its really working without exceptions!