Is last working day?

// ----------------------------------------------------------------------
private static DateTime LastDayOfMonth( int year, int month )
{
  return new DateTime( year, month, DateTimeFormatInfo.CurrentInfo.Calendar.GetDaysInMonth( year, month ) );
} // LastDayOfMonth

// ----------------------------------------------------------------------
private static bool IsLastDayOfMonth( DateTime test )
{
  DateTime lastDayOfMonth = LastDayOfMonth( test.Year, test.Month );
  return test.Day == lastDayOfMonth.Day;
} // IsLastDayOfMonth

// ----------------------------------------------------------------------
private static bool IsLastWorkingDayOfMonth( DateTime test )
{
  DateTime lastWorkingDayOfMonth = LastDayOfMonth( test.Year, test.Month );
  while ( lastWorkingDayOfMonth.DayOfWeek == DayOfWeek.Saturday || 
    lastWorkingDayOfMonth.DayOfWeek == DayOfWeek.Sunday )
  {
    lastWorkingDayOfMonth = lastWorkingDayOfMonth.AddDays( -1 );
  }

  return test.Day == lastWorkingDayOfMonth.Day;
} // IsLastWorkingDayOfMonth