What are the most common (and often overlooked) causes of memory leaks in managed (.net) applications?

Question

Please can anyone recommend a quick checklist / best practice guide to help us avoid simple (but subtle) mistakes that cause could cause memory leaks in .net apps

I find

Answer 1

Circular references in value-classes (commonly in the model-layer of your application) can easily hide their leaks as well. In theory, don't do them, in practice, be aware whenever you need to do them :)