How to set number of copies in crystal reports?

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C#3.0

C#

C#4.0

CrystalReports

I am creating a crystal reports using Visual Studio 2010 and using ADO Dataset for database field on report. now i want to set default 2 copies of bill on print button on crystal report viewer. code which i have written on crystal report viewer load is

Report.Bill objRpt = new Report.Bill();
objRpt.SetDataSource(DT1);
objRpt.PrintToPrinter(2, true, 0, 0);
crystalReportViewer1.ReportSource = objRpt;
crystalReportViewer1.Refresh();

But it is printing only single copy of bill. Can anyone tell me how can I fix that? I am very new in crystal reports.