How to: Set Multiple Startup Projects
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Visual Studio allows you to specify how more than one project is run when you start the debugger.
To set multiple startup projects
In the Solution Explorer, select the solution (the very top node). Right-click the node to get the context menu.
Select Properties. The Solution Property Pages dialog box opens.
Expand the Common Properties node, and click Startup Project.
Click Multiple Startup Projects and set the appropriate actions. For more information, see NIB How to: Modify Project Properties and Configuration Settings.