This tutorial shows you how to print directly the Report without going through the Crystal Report Viewer in C#.NET Windows Forms Application.

To print crystal report directly to printer in c# windows application you can modify your code as the following.

public void PrintReport(string reportPath, string PrinterName)
    CrystalDecisions.CrystalReports.Engine.ReportDocument rptDoc =
                        new CrystalDecisions.CrystalReports.Engine.ReportDocument();
    rptDoc.PrintOptions.PaperOrientation = PaperOrientation.Portrait;
    rptDoc.PrintOptions.PaperSize = PaperSize.PaperA4;
    rptDoc.PrintOptions.PrinterName = PrinterName;
    rptDoc.PrintToPrinter(1, false, 0, 0);

public void Print()
    PrintReport(Application.StartupPath +"\\csharpcode.rpt","Your printer name");

The rptDoc.PrintToPrinter method prints the specified pages of the report to the selected printer with the help of the PrintOptions.PrinterName property.

You can also add a button into your winform, then you can print your report with the button instead of using the crystal report viewer.