// Implement functions and properties of IBL
 /// <summary>
 /// add a room to the collection
 /// </summary>
 /// <param name="room">room</param>
 /// <returns>true if success, false else</returns>
 public bool AddRoom(Room room)
 {
     if (room.RoomID < nextRoomNumber)
     {
         return(false);
     }
     if (!myDal.AddRoom(room))
     {
         return(false);
     }
     nextRoomNumber = room.RoomID + 1;
     return(true);
 }