using System;

using System.Collections.Generic;

using Newtonsoft.Json;

public class Program

{

    public static void Main()

    {

        var carsa = new ListOfCarsA();

        carsa.Cars.Add("Toyota");

        carsa.Cars.Add("Lexus");

        Console.WriteLine(JsonConvert.SerializeObject(carsa, Formatting.Indented));

        var carsb = new ListOfCarsB();

        carsb.Add("Nissan");

        carsb.Add("Infiniti");

        Console.WriteLine(JsonConvert.SerializeObject(carsb, Formatting.Indented));

    }

}

​

public class ListOfCarsA

{

    public string CollectionName { get { return "CarsA"; } }

    public List<string> Cars { get; set; }

    public ListOfCarsA()

    {

        Cars = new List<string>();  

    }

}

​

public class ListOfCarsB : List<string>

{

    [JsonProperty("CollectionName")]

    [JsonRequired]

    public string CollectionName { get { return "CarsB"; } }

}