Good article in the latest MSDN Magazine that provides a description of how many of the popular design patterns are used in the .NET Framework.
Here are some of the design patterns mentioned and their use in the .NET Framework:
- Observer Pattern
- Iterator Pattern
- Decorator Pattern
- Adapter Pattern
- Factory Pattern
- Strategy Pattern
- Composite Pattern
- Template Method Pattern
- Intercepting Filter Pattern
- Page Controller Pattern
It is a quick read and not to detailed, but a good article nonetheless. Read it here.