using System;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {

        SortedList<int, string> planets = new SortedList<int, string>() {

            { 1, "Mercury" },

            { 2, "Venus" },

            { 3, "Earth" }

        };

​

        // Value by key

        Console.WriteLine(planets[1]); // Get Mercury

        Console.WriteLine(planets[3]); // Get Earth

        //value by index

        Console.WriteLine(planets.Values[1]); // Get Venus

        //key by index

        Console.WriteLine(planets.Keys[1]); // Get Venus key

    }

}