Take the 2-minute tour ×  Visual Studio will automatically
create using statements for you whenever you create a new page
or project. Some of these you will never use.  Visual Studio has
the useful feature to "remove unused usings".  I wonder if there
is any negative effect on program performance if the using
statements which are never accessed, remain mentioned at the top
of the file.  share|improve this question I did search for it
before asking, and it didn't show up. –  KdgDev Jul 22 '09 at
8:36 FWIW, this posting has better SEO: it was the first result
in Google for me. Of the 2 originals linked, one is unavailable
(removed) and the other is worded differently enough to add some
value to this post, even if just as a redirection. –  DaveD Nov
2 '12 at 19:07  5 Answers 5  up vote 30 down vote accepted  An
unused using has no impact to the runtime performance of your
application.  It can affect the performance of the IDE and the
overall compilation phase. The reason why is that it creates an
additional name