To add a single file to the source-control system:
  1. In the Project Explorer, right-click a file.
  2. Choose Add To Source Control.
  3. Optionally, add a comment to help distinguish this version of the file later.
  4. Click OK.
To add multiple files to the source-control system:
  1. In the Project Explorer, right-click a solution, project, or folder.
  2. Choose Add To Source Control (Recursive).
  3. The dialog will list the files that can be added, i.e., those whose status is Not Controlled.
  4. In that dialog, you can deselect any files you don't want to add to source control.
  5. You may optionally add a comment.
  6. Click OK.