如何在.net网站中创建一个始终在后台运行的线程？

using System;
using System.Threading;

public class BackgroundThread
{
    public static void Main()
    {
        Thread backgroundThread = new Thread(BackgroundWork);
        backgroundThread.IsBackground = true;
        backgroundThread.Start();

        Console.WriteLine("Main thread is running.");
        Thread.Sleep(5000);
        Console.WriteLine("Main thread is exiting.");
    }

    static void BackgroundWork()
    {
        while (true)
        {
            Console.WriteLine("Background thread is running.");
            Thread.Sleep(2000);
        }
    }
}