gistfile1.cs

using System;
using System.Linq;
using System.Threading;

class Test {
	const int NumBusyWaiters = 10;

	public static void Main ()
	{
		AppDomain.CurrentDomain.ProcessExit += (s, e) => {
			Console.WriteLine ("Blocking process exit!");
			while (true) {
				Console.WriteLine ("Blocking process exit!");
			}
		};
		var waiters = Enumerable.Range (0, NumBusyWaiters).Select (n => {
				var t = new Thread (BusyLoop);
				t.Start ();
				return t;
		}).ToArray ();

		Console.WriteLine ("Exiting...");
		Environment.Exit (0);
	}

	static void BusyLoop ()
	{
		while (true) {
			Console.WriteLine ("Working from thread {0}", Thread.CurrentThread.ManagedThreadId);
			Thread.Sleep (1);
		}
	}
}