TOrder ModelToTransporter(ShopModel.Order order)
        {
            TOrder torder = new TOrder {
                orderid     = order.Order_Id,
                date        = order.Date,
                price       = order.Price,
                userid      = order.User_Id,
                isDelivered = order.IsDelivered
            };

            foreach (ShopModel.Order_Item item in order.Order_Item)
            {
                TOrderItem titem = new TOrderItem
                {
                    itemid    = item.Item_Id,
                    productid = item.Product_Id,
                    quantity  = item.Quantity,
                    price     = item.Price
                };
                torder.items.Add(titem);
            }
            return(torder);
        }
 ShopModel.Order TransporterToModel(TOrder torder)
 {
     ShopModel.Order order = new ShopModel.Order
     {
         Order_Id    = torder.orderid,
         User_Id     = torder.userid,
         Date        = torder.date,
         IsDelivered = false,
         Price       = torder.price
     };
     foreach (TOrderItem titem in torder.items)
     {
         ShopModel.Order_Item item = new ShopModel.Order_Item
         {
             Product_Id = titem.productid,
             Order_Id   = titem.orderid,
             Quantity   = titem.quantity,
             Price      = titem.price
         };
         order.Order_Item.Add(item);
     }
     return(order);
 }