private void Form1_Load(object sender, EventArgs e) { Customer customer1 = new Customer(1, "Customer1"); Customer customer2 = new Customer(2, "Customer2"); Goods milk = new Goods(1, "Milk", 69.9f); Goods eggs = new Goods(2, "eggs", 4.99f); Goods apple = new Goods(3, "apple", 5.59f); Order order1 = new Order(1, customer1); order1.AddDetails(new OrderDetail(apple, 8)); order1.AddDetails(new OrderDetail(eggs, 10)); order1.AddDetails(new OrderDetail(milk, 10)); Order order2 = new Order(2, customer2); order2.AddDetails(new OrderDetail(eggs, 10)); order2.AddDetails(new OrderDetail(milk, 10)); Order order3 = new Order(3, customer2); order3.AddDetails(new OrderDetail(milk, 100)); orderService.AddOrder(order1); orderService.AddOrder(order2); orderService.AddOrder(order3); update(orderService.QueryAll()); }