asp.net help to let users send folders to other users of the same website, please?

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Hi. I have a website being written in asp.net which allows users to login and create folders on the server. They then add files (which are held on the server) to those folders, without having to leave the browser, using a simple 'tick a file \ add to a selected folder' interface. This part works fine.

Could someone please let me know the easiest way to let the users share those folders with other users. The users will be working on projects, and need to be able to view \ edit \ delete the files, whether they were the creator of the folder or not.

eg. User 1 has a folder called 'ABC',which contains file '123.doc'
How do I let User 1 share that folder with User 2, so that User 2 can also add \ edit \ view \ delete any files in that folder?

Everything is on a dedicated server, so no other websites, with Windows Server 2008 Standard R2 x86-64 and MySql.

Thanks very much,
Adam

 

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Update : we worked out how to share the folders ! Now we need a way to let a user create a notepad style .txt file that can be added to the folder for viewing by another user.
Any help really appreciated - who knows, if the site works and we make a few quid I'll gladly send some paypal love