help me to print reports

Question

hi i am working in asp.net with c#.i have to generate reports in my application.i have used xml file to generate reports,(ie)getting all database values in a dataset and then from dataset to xmlfile.after that calling the xml file in a web form and displaying the record in a table format.now i want to print the generated values as the report.i have two radio buttons say lanscape and portrait,if i choose lanscape the report should be in form of lanscape or if i choose portrait the report should be in the form of portrait.I want to know how to preview the form in landscape and portrait format,after these preview of lanscape and portrait the user will click the print button to print the report.