using System;

using System.Diagnostics;

using System.Threading;

using System.Threading.Tasks;

​

public class Program

{

    public static void Main()

    {

        string[] colors =

        {

        "1. Red", "2. Green", "3. Blue", "4. Yellow", "5. White", "6. Black", "7. Violet", "8. Brown", "9. Orange", "10. Pink"

        }

​

        ;

        Console.WriteLine("Using Parallel.ForEach");

        //start the stopwatch for "Parallel.ForEach"

        var sw = Stopwatch.StartNew();

        Parallel.ForEach(colors, color =>

        {

            Console.WriteLine("{0}, Thread Id= {1}", color, Thread.CurrentThread.ManagedThreadId);

            Thread.Sleep(10);

        }

​

        );

        Console.WriteLine("Parallel.ForEach() execution time = {0} seconds", sw.Elapsed.TotalSeconds);

        Console.WriteLine("\nTraditional foreach loop");

        //start the stopwatch for "for" loop

        sw = Stopwatch.StartNew();

        foreach (string color in colors)

        {

            Console.WriteLine("{0}, Thread Id= {1}", color, Thread.CurrentThread.ManagedThreadId);

            Thread.Sleep(10);

        }

​

        Console.WriteLine("foreach loop execution time = {0} seconds\n", sw.Elapsed.TotalSeconds);

    }

}