Answer by the-a-monir for Could not find a part of the path ... bin\roslyn\csc.exe

I had a project running in VS2019 and then i open(in VS2019) another project for the first time and i got the above issue. what I did as follow:

1. I close the running project,
2. Clean and rebuild the new project

Only point no. 2 was not working for me.