static void Main(string[] args) { CustomerManager customerManager = new CustomerManager(); customerManager.Add(); customerManager.Read(); customerManager.Update(); customerManager.Delete(); Console.ReadLine(); ProductManager productManager = new ProductManager(); productManager.Add(); productManager.Read(); productManager.Update(); productManager.Delete(); Console.ReadLine(); Customer customer = new Customer(); customer.Id = 1; customer.FirstName = "Cem"; customer.LastName = "Kırmızı"; customer.City = "Argentina"; //other Customer customer2 = new Customer() { Id = 2, FirstName = "Yılmaz", LastName = "Turuncu", City = "Cuba" }; Console.WriteLine(customer.City); Console.WriteLine(customer2.City); Console.ReadLine(); }