Do you really want to transfer a file to a different server? Because if you merely want to copy a file to a location within the webserver, from your server side code, all you probably need to do is a local copy.
If you really want to use FTP, then take a look at the
FtpWebRequest
class. See
http://msdn.microsoft.com/en-us/library/8exfzxft.aspx[
^]