using System.Collections.Generic;
public static void Main()
SortedList<int, Planet> planets = new SortedList<int, Planet>();
var jupiter = new Planet();
jupiter.Name = "4 line: Mercury";
planets.Add(101, jupiter);
planets.Add(102, new Planet() { Id = 2, Name = "1 line: Mercury" });
foreach (var planet in planets)
Console.WriteLine($"{planet.Key}, {planet.Value.Id} : {planet.Value.Name}");
public int Id { get; set; }
public string Name { get; set; }