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What is the best practice for when to implement IDisposable?
Is the best rule of thumb to implement it if you have one managed object in the class, or does it depend if the object was created in the class or just passed in? Should I also do it for classes with no managed objects at all?
If you mean unmanaged objects then yes, you should be implementing it whenever you have one or more unmanaged resource you are handling in your class. You should also be using the pattern when you are possibly holding on to objects that are IDisposable themselves, and make sure to dispose of them when your class is disposed.
(agreed that this question has already been asked enough times as to run a small printer out of ink should they be printed…)