How to set printing page size on rdlc report

Question

hi friends I am working in c# Windows application.How to print page size in rdlc report on runtime via coding not in print properties. Because in my project I have two different page sizes 8.5x6 inches for half of a4 sheet and 8.5x11 inches for invoice. Both can be print on dot matrix printer. How to set print page size while taking print on both reports in rdlc? If I set page size 8.5x6 inches in dot matrix printer, it is used only for half of a4 size. But I want to set 8.5x11 inches for invoice in dot matrix printer also. How to do this?