The System.Globalization namespace provides most of the .NET support for localization in your applications. The two key features in development are listed here:
Cultures— An identifier for a specific locale
Resource files— A storage location for culture-dependent resources such as strings and bitmaps
A culture does not simply define the language to be used; many locales might share the same language and yet have very different localization requirements. As an example, the United Kingdom and the United States both use English as the primary language, but they also use very different formats for currency and dates.