To add a project reference to a .Publish project

  1. From the Solution Explorer, expand the .Publish project.
  2. Right-click References; then select Add Reference from the context menu.
  3. On the left sidebar, expand Solution; then click Projects.

    All projects included in the current solution are listed. Those that are already referenced by the .Publish project appear with a check mark.

  4. Check the project(s) you want to reference.
  5. Click OK.