file send with c# in network

This is not a well framed question! We cannot work out what you are trying to do/ask from the post. Please elaborate and be specific.
Use the "Improve question" link to edit your question and provide better information.

I like how you edit your question and start screaming instead of adding anything relevant. What have you tried? Do you want to File.Copy()? TCPIP? Named pipes? Send in one shot? Stream the file? How are we supposed to know what it is that you want to do from the absolute lack of any kind of information?

You could try NOT SHOUTING. Using all capitals is considered shouting on the internet, and rude (using all lower case is considered childish). Use proper capitalisation if you want to be taken seriously.

This is a wrong question. You cannot ask "how can I send a file", because -- who will receive it? You should ask about two parties together. If you assume something else is already ready to receive file, you should explain what. FTP server? Web page with where you can post a file? If this is something custom, you need to develop code for both sides by yourself.
--SA