/// <summary>
 /// add a reservation to the collection
 /// </summary>
 /// <param name="reservation">reservation</param>
 /// <returns>true if success, false else</returns>
 public bool AddReservation(Reservation reservation)
 {
     if (reservation.Days < 1 || reservation.ReservationID < nextReservationNumber)
     {
         return(false);
     }
     if (!myDal.AddReservation(reservation))
     {
         return(false);
     }
     nextReservationNumber = reservation.ReservationID + 1;
     return(true);
 }