test.cs

using System;
using System.Threading;

namespace testccons
{
	class MyClass
	{
		~MyClass()
		{
			Console.WriteLine("Finalized MyClass");
		}
	}

	class MyClassInThread
	{
		~MyClassInThread()
		{
			Console.WriteLine("Finalized MyClassInThread");
		}
	}

	class MainClass
	{
		public static void Main(string[] args)
		{
			for (int i = 0; i < 50; ++i) {
					SpawnThread();
					GC.Collect();
					GC.Collect();
					GC.Collect();
					GC.Collect();
					GC.WaitForPendingFinalizers();
			}
			Console.WriteLine("Program termination");
		}

		static void SpawnThread()
		{
			var th = new Thread(MyThreadStart)
			{
				IsBackground = true,
			};

			new MyClass();
			th.Start(new MyClassInThread());
			th.Join();
		}

		static void MyThreadStart(object param)
		{
			
		}
	}
}