using System;

using Newtonsoft.Json.Linq;

using MongoDB.Bson;

public class Program

{

    public static void Main()

    {

        var jObject = JObject.Parse("{ json: true, array :[1,2,3,4] }");

        var json = jObject.ToString();

        var bsonDocument = BsonDocument.Parse(json);

        Console.WriteLine("json: {0}", bsonDocument["json"]);

        Console.WriteLine("array[2]: {0}", bsonDocument["array"][2]);

    }

}