using System;

using RestSharp.Serializers;

public class Program

{

    public static void Main()

    {

        var obj = new Order();

        obj.Test = 42;

        var serializer = new JsonSerializer();

        var json = serializer.Serialize(obj);

        Console.WriteLine(json);    

    }

}

​

public class Order

{

    [SerializeAs(Name = "object")]

    public string Object

    {

        get { return "Order"; }

    }

    [SerializeAs(Name = "TestName")]

    public int Test

    {

        get;set;

    }

}