Directly printing the report without showing it in crystal report viewer

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C#

ASP.NET

CrystalReports

Hi , guys...

I want to directly print the report which gets showed in crystalreportviewer..

i tried

rptGP.PrintToPrinter(1, true, 1, 1);

But my report has one parameter and it shows me error that it can't get the parameter value so doesn't print.

my code :

private void printgatepass(string _srno, string _visitorname, string _mobileno, string _company, string _purpose, string _department, string _contactperson, string _city, string _status, string _luggage)
        {
            try
            {
                DataTable dtGatePass = _objVreg.getDataFromQuery("SELECT a.SRNO,a.VISITOR_NAME,a.VISIT_DATE,a.MOBILE_NO,a.COMPANY,a.PURPOSE,b.DEPARTMENT_NAME as DEPARTMENT,c.EMP_NAME as CONTACT_PERSON,a.CITY,a.STATUS FROM VISITOR_REG a,DEPARTMENT b,EMP_DETAILS c WHERE SRNO='" + _srno + "' and a.CONTACT_PERSON=c.EMP_ID and a.DEPARTMENT=b.DEPARTMENT_ID");
               
 DataSet dsGatePass = new DataSet();
                dsGatePass.Tables.Add(dtGatePass.Copy());
                dsGatePass.Tables["Table"].TableName = "dtGatePass";
                Reports.crGatePass rptGP = new Reports.crGatePass();

                DataTable _dttime = _objVreg.gettime(_srno);

                paramField = new ParameterField();
                paramField.Name = "Time";
                ParameterDiscreteValue dsvalue = new ParameterDiscreteValue();
                dsvalue.Value = _dttime.Rows[0][0].ToString();
                paramField.CurrentValues.Add(dsvalue);

                paramFields.Add(paramField);
                rptGP.SetDataSource(dsGatePass);

                CrystalReportViewer1.ParameterFieldInfo = paramFields;
                CrystalReportViewer1.ReportSource = rptGP;
                CrystalReportViewer1.DataBind();
                CrystalReportViewer1.Visible = false;

                rptGP.PrintToPrinter(1, true, 1, 1);
}catch (Exception ex)
         {
             Response.Write(ex.Message);
         }
     }

Please Guide me...Is there any other way i can set parameter value and print the report?