public async Task <string> AddParkingOrder(ParkingOrderDto parkingOrderDto)
        {
            ParkingOrderEntity parkingOrderEntity = new ParkingOrderEntity(parkingOrderDto);
            await parkingLotContext.ParkingOrders.AddAsync(parkingOrderEntity);

            await parkingLotContext.SaveChangesAsync();

            return(parkingOrderEntity.OrderNumber);
        }
        public async Task <int> AddParkingOrder(ParkingOrderDto parkingOrderDto)
        {
            ParkingOrderEntity parkingOrderEntity = new ParkingOrderEntity(parkingOrderDto);

            await this.parkingOrderContext.ParkingOrder.AddAsync(parkingOrderEntity);

            await this.parkingOrderContext.SaveChangesAsync();

            return(parkingOrderEntity.Id);
        }