using System;

using Newtonsoft.Json;

public class Program

{

    public static void Main()

    {

        JsonSerializerSettings settings = new JsonSerializerSettings();

settings.NullValueHandling = NullValueHandling.Ignore;

        var c= new MyClass();

        c.name=null;

        c.lastname="patel";

var myJson = JsonConvert.SerializeObject(c, settings);

        Console.WriteLine(myJson);

        var d= new MyClass();

        d.name=null;

        d.dest=new []{"ok","ok1"};

        d.lastname="patel";

var myJson1 = JsonConvert.SerializeObject(d, settings);

        Console.WriteLine(myJson1);

    }

    class MyClass

{

    public string name;

​

    public string[] dest;

    public string lastname { get; set; }

}

}