Hi, I have visual studio 2019. This week I moved up a version to 16.8.6 from 16.4 as per Microsoft recommendation. I am using MVC framework. I return a view based on a condition as follows. if condition A return View "A" else condition B return View "B" else return View "C" Application runs successfully for showing views A. But for view B it says source not available. I have check my windows directory for my solution, and View B is there, name is correct, spelling is correct yet I just cannot seem to launch View B. I have also tried cleaning the solution and rebuild, removed debug setting 'require source file to exactly match oriinal version' but nothing seems to be working. Your help is appreciated.