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

Definitely. For instance, Factory pattern is used in ADO.NET data provider classes. Singleton pattern is used in .NET remoting. Dispose pattern is used in resource management.