VS2019 linker tool error LNK 1168

Resolve linker tool error LNK 1168.
The reason for the error (the official website's explanation):

In fact, the .exe program is still running in the background after the previous debug, so the newly modified program cannot be compiled and run. The solution is to turn it off. Because the task manager is not easy to find the test2.exe (the name of the generated exe program), a Process Explorer is used to assist in the search:


after finding it, close the corresponding exe program.