FTP Download

Question

Hi all,
I have a trivial problem but I couldn't solve it :(

I'm working in a web site (.net C#) and there's
a link which supposed to download a file from
ftp account directly.

The account information( for example) :

URL: ftp2.Sitename.com
Username: user
Password: pass

First I made direct links to the files in the code
but it gave me
(page cann't be displayed)
and if I typed the full link directly in the explorer
It doesn't even ask me for the login information !

Does anyone know how can I provide the account information
and the file link through code ?

Thnx in advance