@dicytea 11d
There were 2 suggestions for the asker to use ConcurrentDictionary before the asker clarified, and 1 more afterwards (probably because the answerer didn't read through the whole thread).

Other than that one response, this looks like a very constructive back-and-forth (which could've been way shorter if the asker presented his case accurately without exaggerating it), so I don't really see what's wrong with it.