using System;

using System.Diagnostics;

using System.Collections;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {

        var sw = new Stopwatch();

        var arrayList = new ArrayList();

        sw.Start();

        for (int i = 0; i < 100000; i++)

        {

            arrayList.Add(i);

        }

        sw.Stop();

        Console.WriteLine(sw.Elapsed);

        sw.Reset();

        var list = new List<int>();

        sw.Start();

        for (int i = 0; i < 100000; i++)

        {

            list.Add(i);

        }

        sw.Stop();

        Console.WriteLine(sw.Elapsed);

    }

}

​