Multithreaded Applications

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

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

*/