I'm not sure in which discussion this fits in, but I'll try here.
I need to use Unicode in order to use national characters. But I
find a strange behavior that I had not expected. I can't find much from
the documentation about this. I need to know if a character is a letter or
not.
Even if it is a national character. I have tried this code:
    Console::WriteLine(System::Char::IsLetter('A') );
    Console::WriteLine(System::Char::IsLetter('É') );
    Console::WriteLine(System::Char::IsLetter('é') );
    Console::WriteLine(System::Char::IsLetter('Ö') );

I was expecting to get the result
True
True
True
True

But that is not what I get, I get this.
True
False
False
True

 Why do I get False from System::Char::IsLetter('É')

Is there another way to know if a Char is letter or not?

Thorsten