using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading;using System.Threading.Tasks;using System.Diagnostics;using System.Runtime.InteropServices;namespace Threads{  class Program  {    [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]    public static extern int GetCurrentProcessorNumber();    private static int criticalSection = 0;    private static object lockObject = new object();    static void Main(string[] args)    {      Console.WriteLine("==================Sequential calls==============");      Console.WriteLine();      Target();      Target();      Target();      Target();      Target();      Target();      Target();      Target();      Console.WriteLine();      Console.WriteLine("==================Parallel calls==============");      Console.WriteLine();      Action action = new Action(Target);      Parallel.Invoke(new Action[] { action, action, action, action, action, action, action, action });      Console.ReadKey();    }    private static void Target()    {      Thread.Sleep(2000);      lock (lockObject)      {        criticalSection++;        Console.WriteLine(string.Format("Thread ID: {0} and Processor ID: " +          "{1} Critical Variable Value: {2}",          Thread.CurrentThread.ManagedThreadId,          GetCurrentProcessorNumber(), criticalSection));      }    }  }}