Something

class Main
{
	CallBack cb;

	Main()
	{
		this.cb = new CallBack(this);
	}

	dispose(...)
	{
		cb.Dispose();
	}

	destructor
	{
		dispose(false);
	}
}

class CallBack
{
	WeakReference main;
	CallBack(Main main)
	{
		this.main = new WeakReference(main);
		IConnectionPoint something ...;
		something.Advise(this, out cookie);
	}

	dispose(..)
	{
		IConnectionPoint something ...;
		something.UnAdvise(cookie);
	}
}