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I am working on a .net 4.5 application that needs to be mult lingual supporting multi cultures etc. The following is sample list of Countries/Languages Russia / Russian Belgium / French Belgium / Dutch For all the above, there is a CultureInfo object that can be created based upon the above culture names ru-RU fr-BE nl-BE When the user enters the site, I set Thread.CurrentThread.CurrentCulture and Thread.CurrentThread.CurrentUICulture to the culture created with the above names eg. Thread.CurrentThread.CurrentCulture = new CultureInfo("nl-BE", false) Thread.CurrentThread.CurrentUICulture = new CultureInfo("nl-BE", false) All the above names are valid culture names. No however I need to added another culture name, language of English in Russia. But the problem is the code en-RU is not valid so when I create new CultureInfo("en-RU", false) I get a CultureNotFoundException as en-RU is not valid. With this culture, I want the formatting etc of Russia around numbers, dates etc, but I want the language on the site to be English. Is it possbile to create custom CultureInfo objects for invalid culture names with the behaviour of the country (Russia)?

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