Just visualize that obfuscation is there to mess up your metadata so people will find it harder to view your source when they use ildasm or .net reflector.
If you use the community edition of an obfuscation tool, based on what I knew back then .. they don't mess up with strings. That is the yucks part. But the commercial editions enable that for you.
I am not too sure whether there is a enterprise but free tool on this one..