Is there a way to add existing Folders to a Visual Studio Project so that I do not have to do this file by file?
Edit
To make it clear: I want to add references not copies.
This answer applies to visual-studio-2012 and visual-studio-2013, the most up to date versions at the time the question was asked and this answer was given. More recent versions have improved their handling and have other answers here. For someone using the old versions, this answer still applies.
Answer:
I don't think there is, but if you have all the files in one folder, you can add multiple files in one go. Just mark them all in the add file dialog.