Needs some help with something remotely easy

Well, im working on a Pinging program, but i want to be able to ping specific ports.
I am using the Shell command to call up the MS DOS ping utility and pinging from there, but i cannot seem to figure out how to make it ping a specific port with a specific amount of bytes.

Please help me,
Thanks

Try this code from Matthew Gates.

maybe this will help:
command /p ping -?
will list all the ping options.