How to: Unload and Reload Projects
You can make projects temporarily unavailable within a solution, and then restore these projects to available status.
To unload projects from a solution
In Solution Explorer, select a project that you want to unload from the active solution.
On the Project menu, choose Unload Project.
— or —
In Solution Explorer, right-click the project and select Unload Project.
The project is marked (unavailable).
To reload projects into a solution
In Solution Explorer, select a project in the active solution that is marked (unavailable).
On the Project menu, choose Reload Project.
— or —
In Solution Explorer, right-click the project and select Reload Project.
The context menu contains the option Edit <Project Name>.*proj. For more information on this command, see How to: Edit Project Files.
The project is available for editing and inclusion in configuration and build processes.