When vs. Net cannot be debugged, try the following methods in prepare.

Of course, you should first follow the prompts from Microsoft (a warning window will pop up when the development environment cannot be started) to change the area step by step,
If you are lucky, you don't have to refer to me. But in most cases, you are unfortunate. So you might as well take a look at what I said. It's really easy.

1. Open it outside the development environmentProgramFor Web applications, use IE to open the homepage of the application

2. Select the "Debug/process" menu in the development environment. In the pop-up window, select the application to be adjusted,
For webprograms, select aspnet_wp.exe.