public history[] GetHistories()
        {
            var db = new DataEntities();

            return(db.histories.ToArray());
        }
        public order GetOrder(int id)
        {
            var db = new DataEntities();

            return(db.orders.Find(id));
        }
        public order[] GetOrders()
        {
            var db = new DataEntities();

            return(db.orders.ToArray());
        }
        public Product GetProduct(int id)
        {
            var db = new DataEntities();

            return(db.Products.Find(id));
        }
        public bill[] GetBills()
        {
            var db = new DataEntities();

            return(db.bills.ToArray());
        }
        public Product[] GetProducts()
        {
            var db = new DataEntities();

            return(db.Products.ToArray());
        }