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lang-cs
stringis a lexical construct of the C# grammar whereasSystem.Stringis just a type. Regardless of any explicit difference mentioned in any spec, there is still this implicit difference that could be accomodated with some ambiguity. The language itself must supportstringin a way that the implementation is not (quite) so obligated to consider for a particular class in the BCL.stringto be exactly the same as the BCL typeSystem.String, nothing else. That is not ambiguous at all. Of course, you can implement your own compiler, using the C# grammar, and use all of the tokens found like that for something arbitrary, unrelated to what is defined in the C# language specification. However, the resulting language would only be a C# lookalike, it could not be considered C#.stringwithout a using directive for System. You can't do that withString.string. It is needed to abbreviateSystem.String, but, as an alias, it seems quite like, but not exactly the same thing. After several years of C#, though, I'd say, it is safe to simply usestringandstring.Format()and not to worry aboutSystem.String.System.Stringclass is still there, and thestringkeyword is still an alias for it. Just likeSystem.Int32andint. They are literally the same thing.