auto-saved files in my current working directory despite I have set it to C:\temp\emacsbackup

Question

I have the following line in my .emacs to keep auto-saved files in a specific directory:

(setq backup-directory-alist (quote ((".*" . "C:/temp/emacsbackup"))))

And it works, I see the file, say "c:/myworkingdirectory/the_current_working_file", in that C:/temp/emacsbackup as "!drive_c!myworkingdirectory!the_current_working_file".

However, whenever I change the content in the_current_working_file, before I save it, I also see this two files in the working directory c:/myworkingdirectory/:

#the_current_working_file#
.#the_current_working_file

When I save the file the_current_working_file, these two backup disappear.

How do I prevent emacs from creating these two backups in the current working directory?