Chinese (Simplified) is considered to be neutral language. It does not specify any region. The culture name represents the current standard and should be used. As far as I know "zh-CN" is old name and should be avoided. This also depends on which framework version you are running on..
Hi, I want to add Chinese simplified language to the website and I'm not sure which version to choose zh-Hans or zh-CN. I'm not sure if it's at all important - I saw in debugging that zh-Hans is equivalent to zh-CN for .NET CultureInfo. Could you advise?