public static void Main(string[] args) { var customerManager = new CustomersManager(); Console.WriteLine(customerManager.GetCustomerById("NS-77777")); Console.WriteLine("=========================="); //List<Customer> customers = customerManager.GetAllCustomers().ToList(); //customers.ForEach(Console.WriteLine); //Console.WriteLine("=========================="); //customerManager.InsertCustomer("Test-ID2", "Axel", "Stone", 2, "Los Angeles"); customerManager.DeleteCustomerById("Test-ID"); List <Customer> customers = customerManager.GetAllCustomers().ToList(); customers.ForEach(Console.WriteLine); }