using System;

using System.Collections.Generic;

using Newtonsoft.Json;

public class Program

{

    public abstract class Business

    {

        public string Name { get; set; }

    }

​

    public class Hotel : Business

    {

        public int Stars { get; set; }

    }

​

    public class Stockholder

    {

        public string FullName { get; set; }

        public IList<Business> Businesses { get; set; }

    }

​

    public static void Main()

    {

        Stockholder stockholder = new Stockholder

        {

            FullName = "Steve Stockholder",

            Businesses = new List<Business>

            {

                new Hotel

                {

                    Name = "Hudson Hotel",

                    Stars = 4

                }

            }

        };

​

        string jsonTypeNameAll = JsonConvert.SerializeObject(stockholder, Formatting.Indented, new JsonSerializerSettings

        {

            TypeNameHandling = TypeNameHandling.All

        });

​

        Console.WriteLine(jsonTypeNameAll); 

​

        jsonTypeNameAll = JsonConvert.SerializeObject(stockholder, Formatting.Indented, new JsonSerializerSettings

        {

            TypeNameHandling = TypeNameHandling.None

        });

​

        Console.WriteLine(jsonTypeNameAll); 

        Console.WriteLine(jsonTypeNameAll); 

​

        jsonTypeNameAll = JsonConvert.SerializeObject(stockholder, Formatting.Indented, new JsonSerializerSettings

        {

            TypeNameHandling = TypeNameHandling.Auto

        });

​

        Console.WriteLine(jsonTypeNameAll); 

​

    }

}