How to print when you don't know how many pages there are?

I know that to print stuff, you need a PrintDocument control, and you put the data to be printed in that. Then to print, you invoke it's print method. My question comes though, how do you tell it to use as many pages as necessary? I've looked in the Microsoft help, but I haven't found anything that specifically answers my question. Thank you.

EDIT** Being able to print two columns would also be an option. Is there a way to do this besides putting spaces in and making it do it?