using System;

using System.Net;

using System.IO;

using Newtonsoft.Json;

using GeoJSON.Net.Feature;

public class Program

{

    public static void Main()

    {

        JsonSerializer serializer = new JsonSerializer();

        FeatureCollection o = null;

        using (Stream s = getJsonData())

        using (StreamReader sr = new StreamReader(s))

        using (JsonReader reader = new JsonTextReader(sr))

        {

            while (reader.Read())

            {

                if (reader.TokenType == JsonToken.StartObject)

                {

                    o = serializer.Deserialize<FeatureCollection>(reader);

                }

            }

        }

        Console.WriteLine(o.Features.Count);

    }

    public static Stream getJsonData(){

        string url = "https://raw.githubusercontent.com/GeoJSON-Net/GeoJSON.Net/master/src/GeoJSON.Net.Tests/Feature/FeatureCollectionTests_Can_Deserialize.json";

        WebClient MyWebClient = new WebClient();

        byte[] BytesFile = MyWebClient.DownloadData(url);

        MemoryStream iStream = new MemoryStream(BytesFile);

       return iStream;      

    }

}