[Flags]
    public enum Weekday
    {
        None = 0,
        Mon = 1,
        Tue = 2,
        Wed = 4,
        Thu = 8,
        Fir = 16,
        Sat = 32,
        Sun = 64
    }

    public class WorkingDay
    {
        public bool Mon { get; set; }
        public bool Tue { get; set; }
        public bool Wed { get; set; }
        public bool Thu { get; set; }
        public bool Fir { get; set; }
        public bool Sat { get; set; }
        public bool Sun { get; set; }
        public Weekday AllWorkingDays {
            get {
                return (Weekday)WorkingDayFlag;
            }
            set
            {
                int result = (int)value;
                this.WorkingDayFlag = result;
            }
        }
        public int WorkingDayFlag
        {
            get
            {
                Weekday result = this.Mon ? Weekday.Mon : 0;
                result |= this.Tue ? Weekday.Tue : 0;
                result |= this.Wed ? Weekday.Wed : 0;
                result |= this.Thu ? Weekday.Thu : 0;
                result |= this.Fir ? Weekday.Fir : 0;
                result |= this.Sat ? Weekday.Sat : 0;
                result |= this.Sun ? Weekday.Sun : 0;
                return (int)result;
            }
            set
            {
                this.Mon = ((Weekday)value & Weekday.Mon) == Weekday.Mon;
                this.Tue = ((Weekday)value & Weekday.Tue) == Weekday.Tue;
                this.Wed = ((Weekday)value & Weekday.Wed) == Weekday.Wed;
                this.Thu = ((Weekday)value & Weekday.Thu) == Weekday.Thu;
                this.Fir = ((Weekday)value & Weekday.Fir) == Weekday.Fir;
                this.Sat = ((Weekday)value & Weekday.Sat) == Weekday.Sat;
                this.Sun = ((Weekday)value & Weekday.Sun) == Weekday.Sun;
            }
        }
    }