The requested operation cannot be performed on a file with a user-mapped section open

Question

Whenever I tried to copy 4 files into my bin folder, after stopping the main service, I am getting an error with one file (TexteDll). The error is:

Cannot co         


        

Answer 1

Are you running any Anti-virus software. It's possible that the AV software (or some other piece of software) was reading the file using the file mapping APIs which caused the problem.

Answer 2

Others have already established that this error is due to another application having a lock on the file. Just wanted to point out that git diff locks files as well until you quit out of it. That's what caused this in my case.

Answer 3

I had the same issue. How I resolved it was:

1. Open "Task Manager"
2. End task "Explorer.exe"
3. Click "File" --> Create new task -- Type in "explorer.exe" --> OK
4. Clean my project and it works

Answer 4

In my case I had to kill a hanging MSBuild.exe process that was locking the file (it was there even after I closed Visual Studio).

Answer 5

My issue was also solved by sifting through the Process Explorer. However, the process I had to kill was the MySQL Notifier.exe that was still running after closing all VS and SQL applications.

Answer 6

in my case deleted the obj folder in project root and rebuild project solved my problem!!!