telnet file transferring?

a while back before i got into programming, i logged into this server using telnet... i was able to download/upload files, etc.

i was wondering how i can transfer files across through a telnet connection

Well, this is a VB forum, and not a telnet one.... but you will basically need to use a telnet client to connect to a suitable server, log in most likely using a username and password, and then send text strings to be interpreted as commands.
This process varies depending on the server, and there are tons of different servers and therefore loads of different protocols.
I've done an example of a very basic telnet client written in VB in the Code Library which you can check out.

There is no direct file-transfer protocol that is part of telnet, rather
telnet is a pretty low-level transfer of bytes from one computer to
another one. This means if you have a file transfer option in a
telnet program, it was programmed on top of telnet. There are
many protocols that could be used for this, my guess is it was
zmodem. Of course, this requires that there be zmodem built into
the server too.