It is absolutely necessary that everyone can define their StartUp Project themselves, as Jon has already said. But to have a dedicated default one would be great, and as I can tell, it is possible!
If you don’t have a .suo file in your solution directory, Visual Studio picks the first project in your .sln file as the default startup project.
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Close your Visual Studio and open the .sln file in your favorite text editor. Starting in line 4, you see all your projects encapsulated in
Project
–EndProject
lines. -
Cut and paste the desired default startup project to the top position.
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Delete your .suo file.
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Open your solution in Visual Studio. Ta daa!