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What is the difference between
public delegate void SecondChangedHandler(Object clock, TimeInfoEventArgs ti);
public event SecondChangedHandler OnSecondChanged;
and
public event EventHandler<TimeInfoEventArgs> OnSecondChanged;
When should you use which and is there any best practice?
Before generics the first approach was the only option to declare an event handler delegate. Since generics were introduced in .NET 2.0, EventHandler<T:EventArgs> is the preferred way. Semantically there is no difference between them.
There is no difference indeed. Then EventHandler<T> (msdn) has just been added as a "shortcut" to avoid having to redeclare the delegate.
