GetDayOfWeek

public static IEnumerable<DayOfWeek> GetDayOfWeek(this int dayMask)
{
    if ((dayMask & 1) > 0)  return DayOfWeek.Monday;
    if ((dayMask & 2) > 0)  return DayOfWeek.Tuesday;
    if ((dayMask & 4) > 0)  return DayOfWeek.Wednesday;
    if ((dayMask & 8) > 0)  return DayOfWeek.Thursday;
    if ((dayMask & 16) > 0) return DayOfWeek.Friday;
    if ((dayMask & 32) > 0) return DayOfWeek.Saturday;
    if ((dayMask & 64) > 0) return DayOfWeek.Sunday;
}