Is sa1200 All using directives must be placed inside the namespace (StyleCop) purely cosmetic? [duplicate]

Answer 1

It definitely won't help with GC.

Here's the discussion about two styles:

http://blogs.msdn.com/abhinaba/archive/2006/08/21/709051.aspx

http://blogs.msdn.com/abhinaba/archive/2008/07/08/do-namespace-using-directives-affect-assembly-loading.aspx