Multithreaded Applications

I wrote the following test program, which makes use of several classes in the System.Threading namespace:

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using System; using System.Threading;   namespace ThreadingApp {     public class Program     {         static void Main(string[] args)         {             Program program = new Program();             program.RunApp();             Console.ReadKey();         }           public void RunApp()         {             ThreadPool.QueueUserWorkItem(ThreadMethod, "Thread 1");             ThreadPool.QueueUserWorkItem(ThreadMethod, "Thread 2");             ThreadMethod("Thread 3");             ThreadPool.QueueUserWorkItem(ThreadMethod, "Thread 4");             Console.WriteLine("Main thread exits.");                           Thread myThread = new Thread(new ThreadStart(ThreadCallback));             myThread.Name = "My Thread";             myThread.Priority = ThreadPriority.Highest;             Console.WriteLine("From runapp, {0}.ThreadState={1}", myThread.Name, myThread.ThreadState);                       myThread.Start();                       }           void ThreadCallback()         {             Console.WriteLine("Calling ThreadCallback");             Console.WriteLine("{0}.ThreadState={1}", Thread.CurrentThread.Name, Thread.CurrentThread.ThreadState);                   }           void ThreadMethod(Object stateInfo)         {             String state = (String) stateInfo;             if (Thread.CurrentThread.IsBackground)             {                 Console.WriteLine("background thread: " + state);             }             else             {                 Console.WriteLine("foreground thread: " + state);             }         }     } }   /* Resulting output:   foreground thread: Thread 3 Main thread exits. background thread: Thread 1 background thread: Thread 2 background thread: Thread 4 From runapp, My Thread.ThreadState=Unstarted Calling ThreadCallback My Thread.ThreadState=Running   */