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

Matt picture Matt · Jul 2, 2009 · Viewed 20.7k times · Source

Possible Duplicate:
Should Usings be inside or outside the namespace

sa1200 All using directives must be placed inside the namespace (StyleCop)

Is this just for code readibility or is there any actual advantage to doing so? Does it help the GC somehow?