Config Paper Size in VB.net

Dear All,

I am writing a vb.net web program. One of the functions need to print out a document to an impact printer with 210mm x 130mm paper size. How could I customize the paper size for the impact printer in VB. So that, if the content of a document is out of the range of the paper size, the printer will ask for a new paper instead of keep printing (treat the paper as A4 size, not a customeized paper size) Thanks. :(

Actually I don't know how I can print out a document in VB.net :(

Chris