public List <string> UpdateCalendar()
        {
            Calendar       _Calendar = Calendar.GetInstance();
            List <Booking> _RetrivedCalendarDates = new List <Booking>();
            List <string>  _UpdatedCalendarDates  = new List <string>();


            _RetrivedCalendarDates = _BookingRepo.RetrieveCalendarDates();
            _UpdatedCalendarDates  = _Calendar.UpdateCalendar(_RetrivedCalendarDates);

            return(_UpdatedCalendarDates);
        }