static void Main() { var driver = new Driver { Name = "Lars", Age = 27, Car = new Car { Model = "VW Polo", CarMileage = 500000 } }; var pimpShow = new PimpMyRide(); Console.WriteLine("Before: " + driver.Car); var pimpedCar = pimpShow.PimpIt(driver.Car, Wish); Console.WriteLine("Now: " + pimpedCar); Console.Read(); }