I wanted to stop that because I didn't need them all to start and I wanted to keep the system resources. Select the web application project. Go to the properties tab. Find the "Always Start When Debugging" option and set it to False.
Tuesday, October 12, 2010
Stop All Visual Studio Web Applications From Starting When Debugging
If you have a Visual Studio solution with more than one web application project, when you start the debugger you'll likely find that all the web applications will start their own ASP.NET Development Server instance.