Null Object Pattern
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Covers a simple design pattern implemented in c# there's a better quality version available at http://chocolatefordogs
Sometimes i make the joke that design patterns are all about getting rid of if-else statements from your code
This article shows how a null object can be dynamically generated with a proxy
Null objects are intended to provide first-class citizens as a replacement for the primitive value none
Some christening gown patterns also come with a matching bonnet