Showing how finalizers work

FinalizerDemo

Managed managed = new Managed();
await Task.Delay(1000);
Console.WriteLine("managed is now null.");
managed = null;
Console.WriteLine("press any key to make the GC collect");
Console.ReadLine();
GC.Collect();
Console.ReadLine();

class Managed
{
    int X;
    ~Managed()
    {
        Console.WriteLine("Managed object has been cleaned up.");
    }
}