Peer to Peer network file transfers

I would like to implement a project that would work across the internet.

The scenario is having some files on a server, and clients should update they're files from the server's folder. But i was thinking of sharing the traffic, i should implement something like peer to peer, so files could shared between clients too! Say client 1 downloaded a file from the server, client 2 and client 3 could download the file from client 1, or client 2 from server and client 3 from client 1, or they could download from both sources!

I guess i should implement a server-client solution. But i hang on th开发者_运维技巧e p2p thing that i never used before and don't know any libraries on the subject. I have some knowledge over TCP protocol but this could serve on direct file transfer from server to client.

I use .NET 3.5 SP1 and C#.

Any suggestions on where to begin searching?

You might want to look at MonoTorrent. It's a complete library written in C#. It can be found here.

And here's a Code Project article about P2P in C#: Generic P2P Architecture, Tutorial and Example