Why are you using English locale for Chinese?
It would not be surprising if the Unicode support was weaker in C# than in Perl, but I have no experience witn C# and it is not mentioned in Unicode Good, Bad, & Ugly.
I have no experience with sorting Chinese. I have studied articles like What's wrong with sort and how to fix it, though, and at work I am dealing mostly with Czech, which fortunately uses Latin letters (plus some less common diacritics like ř or ů), but whose "official" sorting algorithm is unfortunately practically unimplementable (e.g. numbers should be sorted as pronounced).
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