static void Main(string[] args) { var userApp = new UserApp(); userApp.Add(new User { Login = "******", Password = "******" }); userApp.Add(new User { Login = "******", Password = "******" }); userApp.Add(new User { Login = "******", Password = "******" }); var users = userApp.GetAll(); foreach (var item in users) { Console.WriteLine($"Login: {item.Id}-{item.Login}"); } Console.ReadLine(); }