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NET Framework are managed applications. They re made of CIL and metadata, and they re JIT compiled at run time and executed by the CLR. Languages such as C and Visual Basic. NET are syntactic tools for generating CIL. For the first time in programming history, language is unimportant because, at the end of the day, all languages exercise the same set of features in the CLR and FCL. Ironically, the. NET Fr.