Hi @Dave Barnard ,
Welcome to Microsoft Q&A!
Please try the following:
- Update your VS2022 to the latest version with Visual Studio Installer and launch it again.
- Enter “devenv /ResetSettings” at Developer Command Prompt for VS 2022 to restore your Visual Studio default setting.
- Close all running VS instances and delete the hidden .vs, bin and obj folders in the project folder.
- Rebuild the project.
- Create a new project and check that it works properly.
- Ensure you are using "Build + IntelliSense" in the Error List window.
Sincerely,
Anna
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