title: Visual Studio displaying errors even if projects build
body: <p>I have a problem with Visual Studio on a C# solution. It displays totally random errors, but the projects build. Right now, I have 33 files with errors, and I can see red squiggly lines in all of them.</p>
  <p>I tried cleaning / rebuilding the solution, closing Visual Studio and even restarting my computer. I can modify .cs files and I see the changes in the solution.</p>
  <p>Does anyone have an idea about why it does that?</p>