	Memory management notes
	About collections The .NET Framework implements dynamic arrays like Collections with a static-sized array and a size identifier. If an item is removed from this collection, the size identifier is lowered. The static-sized array can still contain a reference to the object, therefore it can still show the item in a memory profiler. An example of this is Form.OwnedForms. Even if you remove a Form from this collection, the collection still has a reference to the Form and the Form will not get disposed yet. Form.Owner When setting the Owner property of a Form, it will add a strong reference to the Form in the Owner. Because of this, the Form will not be cleaned up when all references are lost. Dispose the Form manually or reset the Owner property when you are done with it. Calling the Close method will also result in a Dispose(), so closing the form is also a solution. Links Here are some interesting external links about memory management: Simulating "Weak Delegates" in the CLR A solution for creating Weak Delegates. - Greg Schechter's Blog Simulating Weak Delegates for EventHandler-like Delegates An attempt to create an simpler solution then the one from Greg Schechter's blog. - Ian Griffiths Blog WeakReference and InvalidOperationException in the finalizer Why does my WeakReference throw an InvalidOperationException when I use it from my finalizer? - Brad Abrams Blog WeakReference class The (Mono) sourcecode of the WeakReference class. - Koders.com

	Qios.DevSuite.MemoryPack
	Updated Version: 2006-09-07

Memory Management

Memory management
Introduction about automatic memory management and its problems.

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Publishing and consuming
Explains how to publish and consume events using the QWeakEvent structure to prevent controls from being ignored by the garbage collector.

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QWeakMessageFilter and
QWeakReferenceCollection
Shows how to create a collection of weak references and a weak IMessageFilter implementation.

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Other notes and links
A few other notes and links about memory management

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Qios.DevSuite.MemoryPack
Screenshots
Some MemoryPack screenshots that illustrate the difference when using our technique

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Download
Qios.DevSuite.MemoryPack
Download the free and opensource library & sample application that shows the difference between normal event handling and using the QWeakEvent structure.

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