static void Main(string[] args)
{
CustomerManager customerManager = new CustomerManager();
Customer[] customers = customerManager.GetCustomers();
customerManager.MusteriEkle(customers);
customerManager.MusteriList(customers);
customerManager.MusteriUpdate(ref customers[2], "Muhammed Sencer", customers[2].Soyadi, customers[2].MusteriNumarasi);
customerManager.MusteriEkle(customers[2]);
customerManager.MusteriList(customers);
}