public static void OldWay()
        {
            var system = new SolarSystem();
            system[1] = "Mercury";
            system[3] = "Earth";
            system[6] = "Saturn (I guess)";

            system.Dump("Old way");
        }
        public static void NewWay()
        {
            var system = new SolarSystem()
            {
                [1] = "Mercury",
                [3] = "Earth",
                [6] = "Saturn (I guess)"
            };

            system.Dump("New way");
        }