using System;

using System.Collections.Generic;

​

public class Program

{

    public class OperatingDTO

    {

        public int Id { get; set; }

    }

​

    public static void Main()

    {

        var operatingDTOs = new List<OperatingDTO>();

        //operatingDTOs[0] = 1;

        operatingDTOs.Add(new OperatingDTO{Id = 0});

        operatingDTOs.Dump();

    }

}