public List <long> SaveOrders(List <Order> pOrders)
        {
            using (var db = new OrderDContext())
            {
                var saveOrder = db.Orders.AddRange(pOrders);
                db.SaveChanges();

                return(saveOrder.Select(x => x.Id).ToList());
            }
        }
        public long SaveOrder(Order pOrder)
        {
            using (var db = new OrderDContext())
            {
                var saveOrder = db.Orders.Add(pOrder);
                db.SaveChanges();

                return(saveOrder.Id);
            }
        }
        public bool UpdateOrders(List <Order> pOrders)
        {
            using (var db = new OrderDContext())
            {
                foreach (var order in pOrders)
                {
                    var updateOrders = db.Orders.SingleOrDefault(x => x.Id == order.Id);
                    updateOrders.CustomerId  = order.CustomerId;
                    updateOrders.DateEvent   = order.DateEvent;
                    updateOrders.InventoryId = order.InventoryId;

                    db.SaveChanges();
                }

                return(true);
            }
        }