public async Task<ShipmentFormModel> GetShipmentForEditAsync(int shipmentId)
        {
            Shipment shipment = await this.shipmentRepo.All()
                .Include(x => x.Sender)
                .Include(x => x.Receiver)
                .FirstOrDefaultAsync(x => x.Id == shipmentId);

            if (shipment == null)
            {
                throw new NullReferenceException(ShipmentNotExist);
            }

            ShipmentFormModel model = new ShipmentFormModel()
            {
                Id = shipment.Id,
                TrackingNumber = shipment.TrackingNumber,
                SenderFirstName = shipment.Sender.FirstName,
                SenderLastName = shipment.Sender.LastName,
                SenderPhoneNumber = shipment.Sender.PhoneNumber,
                ReceiverFirstName = shipment.Receiver.FirstName,
                ReceiverLastName = shipment.Receiver.LastName,
                ReceiverPhoneNumber = shipment.Receiver.PhoneNumber,
                PickUpAddress = shipment.PickupAddress,
                PickUpTown = shipment.PickUpTown,
                PickUpCountry = shipment.PickUpCountry,
                DestinationAddress = shipment.DestinationAddress,
                DestinationTown = shipment.DestinationTown,
                DestinationCountry = shipment.DestinationCountry,
                Weight = shipment.Weight,
                DeliveryWay = shipment.DeliveryWay,
                DeliveryType = shipment.DeliveryType,
                ProductType = shipment.ProductType,
                Price = shipment.Price,
            };

            return model;
        }