static void Main(string[] args) { GamerManager gamerManager = new GamerManager(new InMemoryGamerDal()); gamerManager.Delete(125); gamerManager.Update(new Gamer { Id = 124, FirstName = "Yağmur", LastName = "-", BirthYear = 1997, IdentityNumber = 123123222 }); gamerManager.Add(new Gamer { Id = 126, FirstName = "Şevval", LastName = "-", BirthYear = 1999, IdentityNumber = 122112344 }); foreach (var gamer in gamerManager.GetAll()) { Console.WriteLine(gamer.FirstName); } }