using System;

using Newtonsoft.Json.Linq;

public class Program

{

    public static void Main()

    {

    JArray array = new JArray();

    array.Add(1);

    array.Add(3);

    JObject oo = new JObject();

    oo["MyArray"] = array;

    string myjson = oo.ToString();

    Console.WriteLine(myjson);

​

    }

}