Change language english to arabic in ASP.NET MVC website

Making a site multi-lingual is a huge undertaking, especially from letter based to script based as it's not just the words but orientation, then you have differences in dates, currency, number formats etc. Google "asp.net multilingual website" and you'll find examples of how to use resource files to deliver multiple languages, it's going to involve you rewriting your site though and also coming up with the translations yourself. If you could simply make one site convert to any language then every website would be muilti-lingual for every language, but they're not because it is far from a trivial task.