Hi @nonnon1 ,
Welcome to Microsoft Q&A!
Which version of Visual Studio are you using? Have you tried to create a new project in Visual Studio and check if the error squiggles exists or not?
For your issue, please navigate to Tools > Options > Text Editor > General and check “Show error squiggles”.
Meanwhile, you can also try to delete the hidden .vs
, bin
and obj
folders in the project folder and reopen your solution.
Sincerely,
Anna
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