Deny access to folders and content in it, lying in my Website folder

Deny access to folders and content in it, lying in my Website folder

I short, i don't want a user to access folders and the data or files in
it....
I searched a bit and i come up with "deny from all" but it is not working
when i put it on ftp.....but on localhost its working... I write the below
given code in my upload folder
# .htaccess mod_rewrite
RewriteEngine On
deny from all