title: No "Directory" or "File" in System.IO
body: <p>I've just started to use new VS2012 and Windows 8 and create C# Metro-style project. I want to get list of files in directory, but string "Directory.GetFiles(path)" invoke an error saying it doesn't exist in current context. But I use System.IO.
  The only useful thing I have in System.IO is "Path" - no "Directory" or "File" there. Where is the problem?</p>