Brad Abrams describes the System namespace, which is the root of all namespaces in the .NET Framework, containing all other namespaces as subordinates. Elsewhere, in another chapter, Dan Kent picks apart the code of the online community application seeing how it works.
I think the keywords if, else, using, etc… should all be in the System namespace… It would make more sense to put _everything_ there instead of only some of everything. It would make sense.
Oh and also, may as well put all the punctuation in there while you’re at it. It would make sense.