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());
}