static void Main(string[] args)
{
IndividualCustomer customer1 = new IndividualCustomer();
customer1.Name = "Meltem";
customer1.Surname = "*****";
customer1.Id = 12;
customer1.CustomerNumber = "123";
CorporateCustomer customer2 = new CorporateCustomer();
customer2.Id = 15;
customer2.CustomerNumber = "123";
customer2.CompanyName = "Company";
customer2.TaxNu = "4565";
Customer customer3 = new IndividualCustomer();
Customer customer4 = new CorporateCustomer();
CustomerManager customerManger = new CustomerManager();
customerManger.Addition(customer1);
customerManger.Addition(customer2);
customerManger.Addition(customer3);
customerManger.Addition(customer4);
}