How to implement File Transfer in jabber net

Currently I created the chating application which is windows application(c#). I created basic Client version which help of jabber net wh开发者_StackOverflow社区ich internally uses XMPP protocol and openfire server.Now I had to implement File Transfer between two users in jabber net. I have searched lot but there no solution for this aproach in c#

http://www.ag-software.de/agsxmpp-sdk.html supports Filetransfers. It's released under a dual license for commecial and open source use. You can also compile a C++ libary and use the function in your C# code. Gloox is a well known libary, that support file transfer.

Just implement this: http://xmpp.org/extensions/xep-0096.html

If your libraries don't have an implementation already, that might be rather complex.