using System;

using System.Linq;

using Newtonsoft.Json;

using System.Collections.Generic;

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

​

​

public class Program

{

    public static void Main()

    {

        string example =  "{'X':'abc'}";

        try

        {

        var result = JsonConvert.DeserializeObject<sample>(example);

        Console.WriteLine(result.CDI == null);

        }

        catch(JsonReaderException ex)

        {

            Console.WriteLine(ex);

        }

    }

}

​

public class sample{

    public string CDI { get; set;}

}

​