If the entered dll name is changed, delete the dll manually.

1. After I change the dll name, the dil under bin will not be automatically deleted. Two Dll files are stored in the bin directory. Therefore, the program cannot run.

2. I don't know why at first, because I am prompted to say that asp.net/temphas a re-defined image. If the files under asp.net \ temp are lost and the vscache files are deleted, the files are still invalid and restarted. It still does not work. You only need to take a closer look at the bin directory and find that the original dll still exists. Then, kill her. Then the system is OK.