c#

Possible Duplicate:
What is so bad about Singletons?
Singleton Design Pattern: Pitfalls

I hear a lot of this but din't find firm reason for it.

Avoid the singleton anti-pattern and replace it with DI.

but, why?

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Stateful singletons are much more difficult to unit test.

I use stateless singletons which I don't see a problem with.

Since singletons can implement interfaces, they can be passed using dependency injection (and should be passed as such where possible)

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