The startup project is the project in a Visual Studio solution that starts when you choose an execution command such as Start from the Debug menu.
To choose a startup project
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In Solution Explorer, right-click a project name, and on the shortcut menu, click Set as StartUp Project.
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If you want to debug more than one project, you can choose multiple startup projects.
To choose multiple startup projects
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In Solution Explorer, right-click the solution name, and on the shortcut menu, click Properties.
The Solution Property Pages dialog box appears.
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In the Solution Property Pages dialog box, select the Multiple Startup Projects option.
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Below Multiple Startup Projects is a grid with two columns, Project and Action. In the action column:
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For each project you want to debug, click the Action column, and select Start.
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For a project you want to run without debugging, click the Action column, and select Start without debugging.
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For a project you do not want to run, click the Action column, and select None.
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Click OK.