using System;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {

        // need not to specify size

        List<int> numbers = new List<int>();

        // adding values to the list

        numbers.Add(1);

        numbers.Add(2);

        numbers.Add(3);

        // accessing the list, same as array

        Console.WriteLine($"numbers[0]: {numbers[0]}");

        Console.WriteLine("-------");

        // dynamically-sized

        // .Count is used instead of .Length

        Console.WriteLine($"Size: {numbers.Count}");

        Console.WriteLine("-------");

        numbers.Add(4);

        Console.WriteLine($"Size: {numbers.Count}");

    }

}