// then print, this is the important thing here
CrystalReportViewer1.PrintMode = CrystalDecisions.Web.PrintMode.ActiveX;
CrystalReportSource1.ReportDocument.PrintOptions.PaperSize = CrystalDecisions.Shared.PaperSize.DefaultPaperSize;
CrystalReportSource1.ReportDocument.PrintOptions.PaperSource = CrystalDecisions.Shared.PaperSource.Auto;