Printing in Parallel Port C# Program changed to USB How to change the program

In Windows Application
A program running for sticker printing in parallel port now
the program changed to New PC windows 8.1.
that new system will not have parallel port.

Process.Start(Batchfile);

sends the file to printer
How can i change the program to send through USB port.

Any one advice, thanks in advance.
Vinoth Kannan.P