Secure file delivery - asp.net or other options.

Hi Folks,

Just looking for some pointers here as to how to deliver downloads to logged in users.

Problem:
Teh boss wants a secure area on the site that requires users (clients) to have registered an account in order to gain access to certain files - tech documents, vids etc that we don't want the public to have access to.

Thinking:
I have MS VS2010 available to code this in ASP.NET and am leaning towards this as the best option so far as it's a natural progression from VB.NET which I'm (reasonably) proficient at - the rest of the site (basically a brochure site) is already done in in a mix of EW4 / jquery / etc.

ASP.NET also has a pretty solid user login/management system, but, lacks any usable front end user administration - however, there is enough info on Google to code a workable admin page for this.

I'm thinking I would need to implement something like this where the required file is streamed via backend code from a non-public location on the server.

Am I on the right track here or have I missed something obvious and / or easier to implement?

Are there any decent plug and play solutions for this out there? If spending a few quid on it meant it saved a heap of time then it's viable although I wouldn't mind gaining the ASPX experience either..

Any suggestions welcome.