using System;

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

public class Program

{

    public static void Main()

    {

        string json = @"{ ""nullProperty"": null, ""stringProperty"": ""hello world"" }";

        dynamic dynamicObject = JsonConvert.DeserializeObject(json);

        DumpProperty(dynamicObject, "stringProperty");

        DumpProperty(dynamicObject, "nullProperty");

        DumpProperty(dynamicObject, "nonExistentProperty");

    }

    private static void DumpProperty(dynamic dynamicObject, string propertyName)

    {

        JObject jo = (JObject)dynamicObject;

        JToken token = jo[propertyName];

        if (token != null)

        {

            Console.Write(propertyName + " exists and is a " + token.GetType().Name);

            if (token.Type == JTokenType.Null)

            {

                Console.WriteLine(" with a value of null.");

            }

            else

            {

                Console.WriteLine(" with a value of \"" + token.ToString() + "\".");

            }

        }

        else

        {

            Console.WriteLine(propertyName + " does not exist.");

        }

    }

}