How to setup Paper size without using PageSetupDialog

Question

i want to set my own paper size for printting without the PageSetupDialog. the case is that, i have "receipt form" that is continued paper (3copies, the size is about W:21.5 cm H:10cm). i can print any infomation on the form with correct position. but when it finished the print process, the printer always feed the paper more than the cut area. ( the "----------" of the paper , i don't know how to call it ^^) 1. So, how to make the printer feed my continued paper fit to the cut area when it finished ? (it should be the paper size , right ? but i don't want to use pageSetupDialog, also pageSetupDialog can't setup my own paper size.) 2. Also when i want to print the next form, How to feed the paper back to the start position ? (now, i push reload button on the printer to do this -_-") (Dot Matrix Printer, C# programming) Thank a lots !!