using System;

public class Program

{

    public static void Main()

    {

        Foo foo = new Foo();

​

        WeakReference fooRef = new WeakReference(foo);

​

        Console.WriteLine(fooRef.IsAlive);

​

        foo = null;

        GC.Collect();

​

        Console.WriteLine(fooRef.IsAlive);

    }

}

​

class Foo

{

    public event Action SomeEvent;

​

    public Foo() { SomeEvent += OnSomeEventHappened; }

​

    private void OnSomeEventHappened() { }

}