using System.Collections.Generic;
public static void Main()
var cities = new Dictionary<string, string>(){
{"UK", "London, Manchester, Birmingham"},
{"USA", "Chicago, New York, Washington"},
{"India", "Mumbai, New Delhi, Pune"}
cities["UK"] = "Liverpool, Bristol";
cities["USA"] = "Los Angeles, Boston";
if(cities.ContainsKey("France")){
cities["France"] = "Paris";
foreach(var kvp in cities)
Console.WriteLine("Key: {0}, Value:{1}", kvp.Key, kvp.Value);