Unicode class names in C# - why do some work, when others don't?

Question

I\'m wondering why this is. I have two unicode characters from the same group Ll, which is allowed according to the specs: http://msdn.microsoft.com/en-us/library/aa664670%2

Answer 1

U+0467 is from Unicode 1.1, whereas U+04FF is from Unicode 5.0. The page you refer to mentions Unicode 3.0. So the compiler's Unicode databases are just not new enough.