LitJSON

using LitJson;
using System;

public class Person
{
    // Person members are defined here ...
}

public class JsonSample
{
    public static void Main ()
    {
        PersonToJson ();
        JsonToPerson ();
    }

    public static void PersonToJson ()
    {
        Person bill = new Person ();

        bill.Name = "William Shakespeare";
        bill.Age  = 51;
        bill.Birthday = new DateTime (1564, 4, 26);

        string json_bill = JsonMapper.ToJson (bill);

        Console.WriteLine (json_bill);
        // {"Name":"William Shakespeare","Age":51,"Birthday":"04/26/1564 00:00:00"}
    }

    public static void JsonToPerson ()
    {
        string json = @"
            {
                ""Name""     : ""Thomas More"",
                ""Age""      : 57,
                ""Birthday"" : ""02/07/1478 00:00:00""
            }";

        Person thomas = JsonMapper.ToObject<Person> (json);

        Console.WriteLine ("Thomas' age: {0}", thomas.Age);
        // Thomas' age: 57
    }
}