using System;

using Newtonsoft.Json;

public class Program

{

    public static void Main()

    {

        // Create object

        var test = new SuccessOne

        {

            StartDate = DateTime.Now,

            EndDate = DateTime.Now.AddDays(7),

            Object = new SuccessOneChild

            {

                Property1 = 1,

                Property2 = "someStr"

            }

        };

        // Serialize

        var json = JsonConvert.SerializeObject(test, new JsonSerializerSettings { TypeNameHandling = TypeNameHandling.All });

        Console.WriteLine(json);

        // Deserialize

        var deserializedObject = JsonConvert.DeserializeObject(json, new JsonSerializerSettings { TypeNameHandling = TypeNameHandling.All });

        // Output type of deserialized object

        Console.WriteLine(deserializedObject.GetType().Name);

    }

}

​

public class SuccessOne

{

    public DateTime StartDate { get; set; }

    public DateTime EndDate { get; set; }

    public SuccessOneChild Object { get; set; }

}

​

public class SuccessOneChild

{

    public int Property1 { get; set; }

    public string Property2 { get; set; }

}