using System;

using System.Collections.Generic;

using System.Linq;

using Newtonsoft.Json;

public class Program

{

    public static void Main()

    {

        string json = @"

            [

              {

                ""Name"": ""Joe Schmoe"",

                ""Birthday"": null

              },

              {

                ""Name"": ""Jane Doe"",

                ""Birthday"": ""1988-10-06T00:00:00""

              }

            ]";

        List<Person> people = JsonConvert.DeserializeObject<List<Person>>(json);

        people = people.OrderBy(p => p.LastName).ThenBy(p => p.FirstName).ToList();

        json = JsonConvert.SerializeObject(people, Formatting.Indented);

        Console.WriteLine(json);

    }

}

​

public class Person  // Version 3

{

    public string FirstName { get; set; }

    public string LastName { get; set; }

    public DateTime? Birthday { get; set; }

​

    // This property is here to support transitioning from the Version 2 model to Version 3

    [JsonProperty]

    private string Name

    {

        set

        {

            if (value != null)

            {

                string[] parts = value.Trim().Split(' ');

                if (parts.Length > 0) FirstName = parts[0];

                if (parts.Length > 1) LastName = parts[1];

            }

        }

    }

}

​