private static bool IsValidFirstDayOfWeek(object value)
{
DayOfWeek day = (DayOfWeek) value;
return day == DayOfWeek.Sunday
|| day == DayOfWeek.Monday
|| day == DayOfWeek.Tuesday
|| day == DayOfWeek.Wednesday
|| day == DayOfWeek.Thursday
|| day == DayOfWeek.Friday
|| day == DayOfWeek.Saturday;
}
#endregion FirstDayOfWeek