using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        List<List<string>> list2d = new List<List<string>>();

        list2d.Add(new List<string>());

        list2d[0].Add("barcode1");

        list2d[0].Add("barcode2");

        list2d.Add(new List<string>());

        list2d[1].Add("barcode3");

        list2d[1].Add("barcode4");

        Console.WriteLine("list2d[0][0] = "+list2d[0][0]);

        Console.WriteLine("list2d[0][1] = "+list2d[0][1]);

        Console.WriteLine("list2d[1][0] = "+list2d[1][0]);

        Console.WriteLine("list2d[1][1] = "+list2d[1][1]);

    }

}