using System;

using Newtonsoft.Json.Linq;

public class Program

{

    public static void Main()

    {

        string json = "{\"name\":\"John\", \"age\":30, \"car\":null, \"spouse\": { \"name\": \"Linda\", \"age\": 28 }}";

        JObject obj = JObject.Parse(json);

        foreach(JProperty c in (JToken)obj)

        {

            Console.WriteLine(c.Name + ": " + c.Value + " ["+c.Type.ToString() + "]");          

        }

        obj["name"] = "Jim";

        Console.WriteLine("=====================");

        Console.WriteLine(obj.ToString());

        Console.WriteLine("=====================");

    }

}