using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        string a = "Norway", b = "France", c = "Chicago",val="";

        Dictionary<string,string> country = new Dictionary<string,string>()

        {

            {"NOR",a},

            {"FRA",b},

            {"ORD",c}

        };

        foreach(KeyValuePair<string,string> cnt in country)

        {

            Console.WriteLine(cnt.Key);

        }

        bool exists = country.TryGetValue("ORD",out val);

        if (exists)

            Console.WriteLine(c);

        else 

            Console.WriteLine("Not existing");

    }

}

​