using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Initialize dictionary");

        var dictionary = new Dictionary<int, string>{ {1, "One"} };

        Console.WriteLine("access existing key 1");

        Console.WriteLine(dictionary[1]);

        Console.WriteLine("-------------------");

        Console.WriteLine("adding new key");

        dictionary[2] = "Two";      

        Console.WriteLine("access new key 2");

        Console.WriteLine(dictionary[2]);

        Console.WriteLine("-------------------");

    }

}