using System;

using Newtonsoft.Json;

public class Program

{

    public static void Main()

    {

        var obj = new ExampleClass();

        var jsons = JsonConvert.SerializeObject(obj, new JsonSerializerSettings() { NullValueHandling = NullValueHandling.Ignore });

        Console.WriteLine("Hello World");

        Console.WriteLine(jsons);

    }

}

​

public class ExampleClass

{

}