Are there any design patterns used in the .NET Framework?

Question

I would like to know: are any GoF design patterns are used in the .NET Framework?

BOUNTY:

I have seen the MSDN link below in an answer. Are

Answer 1

• System.Net.WebClient is an example for the Façade Pattern.
• System.IO.Stream: Classic Async Pattern
• System.ComponentModel.BackgroundWorker: Event-Based Async pattern
• As already mentioned: Dispose pattern is used nearly everywhere in the framework
• System.Control: Template Method Pattern