static void Main(string[] args) { //Customer customer = new Customer {FirstName="Kutay",LastName="Aktaş",UserName="******",Games = "Doom 3"}; //CustomerManager customerManager = new CustomerManager(new ValidationService()); //customerManager.Add(customer); //customerManager.Delete(customer); //SalesManager Sales = new SalesManager(); //Sales.Sell(customer); Game game = new Game { Price = 5000 }; Campaign campaign1 = new Campaign { Percentage = 2593 }; CampaignManager campaignManager = new CampaignManager(); campaignManager.Discount(campaign1, game); }