Visual Studio Editor does not underline errors anymore

Question

My Visual Studio (2008) Editor has stopped to underline Errors (this nifty wavy red lines). I can\'t really tell when, but it can be related to the installation of .Net Fram

Answer 1

For visual studio 2017 act according to HeeJae's comments in:

https://developercommunity.visualstudio.com/content/problem/113112/design-time-error-checking-isnt-working.html

i.e:

Hi. you are probably hitting a known issue. can you try this?

1.Update to latest release If that doesn’t solve it

2.Go to Tools\Options\Projects and Solutions\General and uncheck “Allow parallel project initialization”.

3.Close VS.

4.Delete the “.vs” directory beside their solution file.

5.Reopen VS.

..

thank you

You can re-enable the "Allow parallel project initialization" option after the issue was solved.

I tried to upgrade VS, reset VS settings, clear VS cache and everything people do conventionally but none of them solved this issue! At the end the mentioned solution worked for me magically.

Good luck