Logon To A Remote NAS Drive?

I need to logon to a NAS Drive to query directory listings. All users will be logging into a domain. The NAS also has security set up on it with a different username password.

I will have a handful of users (maybe 10 - each logging into the same domain, but from different pc's) that will need to access a NAS Drive to query a directory structure. All will have physical access, and can connect via windows explorer (manually entering a user and pass).

During my first attempt via my app - I get the error "Logon failure: unknown user name or bad password" Which is good cause I only want a handful of users logging on to this drive. If I logon to the drive via Windows Explorer and then go back to the app and it works.

So what I did was create a multi form app.

- At launch the parent form loads (as well as a logon window within that form). The logon window auto fills a text box with a username. That is pulled from the current logged on user - or can be replaced. I would like each user to then enter a password -> send that to the NAS for authentication -> then either open the app (mentioned above) or give some kind of a message box saying they now have connectivity to the drive.