I'm running visual studio express 2012 on Windows 7 through Bootcamp. I have a solution with several projects, and when I start debugging it runs the first project, but I can't start new instances of the others (when I right click and choose debug -> start new instance it is grayed out).
I tried creating a new solution with two blank projects and I have the same problem.
Any ideas?
Right click on Solution -> Common Properties -> Startup Project -> Multiple startup projects -> Choose "Start" actions in drop-down lists. Now start debugging as usual.
Right Click -> Debug -> Start New Instance is not available for all types of projects. Usually projects of the type class libraires have this option missing.
Thanks, Karthik
Use the new instance of Visual studio in order to debug the other project.
来源：https://stackoverflow.com/questions/16546307/running-multiple-projects-in-visual-studio