EventHandler<T>
Requiring (or strongly advising, for the sake of consistency) developers to create their own EventArgs derived type is enough of a burden for them, but in the early days of .NET even that wasn’t enough. One had to create a custom EventHandler delegate with the typical object sender and MyEventArgs e signature.
Since the advent of .NET 2.0, with the introduction of generics, this was simplified a bit through the introduction of EventHandler<T>:
The generic constraint put on the TEventArgs type argument enforces the correct use of ...
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