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Editorial Team
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Asked: 2026-05-31T02:09:06+00:00

I have a Click Once application (WPF) in C#. Initially when I would hit

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I have a Click Once application (WPF) in C#. Initially when I would hit F5 to debug/launch the application it worked smoothly. Eventually, F5 only would build the solution and not launch the application (therefore I could not step through my code). For a short while I switched from Debug to Release mode and for some reason that allowed the application to launch after using F5 and I could step through my code again. But now that no longer works either. Long story short, I cannot get the application to run in a manner that allows me to step through the code. I can only do a Start without Debugging (Ctrl + F5). Obviously this doesn’t do much for me other than tell me if the application works or not.

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  1. Editorial Team

    You probably have lost your start up project in the solution, or the start up project is messed up, and no correct “item” is defined for the startup.

    Right click on one of your projects, and select : define as startup project.
    Then retry that should do the trick. If not, check in that projects properties to see if a form or something is defined as the startup object for that project.

    Edit : Obviously dont define a class library project as startup project, but choose your UI :).

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