using System;

using System.Threading.Tasks;

public class Program

{

    public static async Task Main()

    {

        string url = "http://www.geonames.org/childrenJSON?geonameId=6255150";

        using (var wc = new System.Net.WebClient())

        {

            var  result = await wc.DownloadDataTaskAsync(url);

            var json = System.Text.Encoding.Default.GetString(result);

            Console.WriteLine(json);

        }

    }

}