using Newtonsoft.Json;

using System;

​

public class Example

{

    public string Field { get; set; }

​

    [JsonProperty("$type")]

    public string Type { get; set; }

}

​

public class Program

{

    public static void Main()

    {

        var obj = new Example

        {

            Field = "field value",

            Type = "type value"

        };

        var result = JsonConvert.SerializeObject(obj, Formatting.Indented);

        var jsonObj = JsonConvert.DeserializeObject<Example>(result);

        Console.WriteLine(result);

        Console.WriteLine("{0}, {1}",jsonObj.Field,jsonObj.Type);

    }

}

​