Realtime Scenario

Can any one give me some real time scenario where those design patterns used .In a Windows based .NET application

Builder
Factory,
Abstract Factory
Singleton,
Visitor
Facade
mohantydAsked:
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Asim NazirCommented:
Singleton:
If you want one and only one instance of an application then this is achieved using singleton pattern. e.g. MSN messenger - remains one messenger even if we click its executable multiple times.
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JaccoCommented:
Here is a MSDN article about patterns being used in the framework itself:

http://msdn.microsoft.com/en-us/magazine/cc188707.aspx
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mohantydAuthor Commented:
I was looking for realtime scenarios
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