using System;

using System.Diagnostics;

using System.Linq;

public class Program

{   

    public static void Main()

    {       

        var lista = Enumerable.Range(0, 50000).Select(indice => Guid.NewGuid()).ToList();

        var relogio = new Stopwatch();

        relogio.Start();

        for (var indice = 0; indice < lista.Count; indice++)

        {

            //var reverse = Enumerable.Reverse(lista[indice].ToByteArray());

        }

        Console.WriteLine(relogio.Elapsed);

        relogio.Restart();      

        foreach (var item in lista)

        {

            //var reverse = Enumerable.Reverse(item.ToByteArray());

        }

        Console.WriteLine(relogio.Elapsed);

        relogio.Restart();      

        lista.ForEach((item) => {

            //var reverse = Enumerable.Reverse(item.ToByteArray());

        });

        Console.WriteLine(relogio.Elapsed);

    }

}