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Switch statement fallthrough in C#?
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Because it is about a not-very-well-known feature of the language. Why would it matter that it's old? I don't think I have ever seen this in use in production code.
An explanation like that at the start would have been helpful. I was reading the page and just didn't understand. Was thinking at first it was to raise awareness of an unanswered question. Couldn't figure it out so I asked.