PrintCashReport cashreport = new PrintCashReport();
rptvwrcash.ReportSource = cashreport;

ParameterFields paramfields = new ParameterFields();
ParameterField type = new ParameterField();
type.Name = "type";

ParameterDiscreteValue dvtype = new ParameterDiscreteValue();
dvtype.Value = DailySalesReportBL.typeofrpt;
type.CurrentValues.Add(dvtype);
paramfields.Add(type);

rptvwrcash.ParameterFieldInfo = paramfields;

//PrintCashReport cashreport = new PrintCashReport();
cashreport.SetDataSource(ds);
cashreport.SetParameterValue("type", DailySalesReportBL.typeofrpt);

//rptvwrcash.ReportSource = cashreport;
System.Drawing.Printing.PrintDocument printDocument = new System.Drawing.Printing.PrintDocument();
cashreport.PrintOptions.PrinterName = printDocument.PrinterSettings.PrinterName;
cashreport.PrintOptions.PrinterName = "EPSON TM-T88V Receipt";
cashreport.PrintToPrinter(1, false, 0, 0);

CRPT.SetParameterValue("smonth", Servercls.month);
CRPT.SetParameterValue("sday", Servercls.day);
CRPT.SetParameterValue("datevalue", Servercls.Datevalue);
Report_Viewer.ReportSource = CRPT;

ReportDocument  CRPT = new ReportDocument();
ParameterFields param = new ParameterFields();
ParameterDiscreteValue paramdesc = new ParameterDiscreteValue();
ParameterField paramfield = new ParameterField();
paramfield.Name = "type";

String APPPATH = Environment.CurrentDirectory + "\CrystalReport1.rpt";
CRPT.Load(APPPATH);
param = CRPT.ParameterFields;
CRPT.ParameterFields.Add(paramfield);
param["type"].CurrentValues.Clear();
paramdecs.Value = "this is you crystal report parameter value value";
param["type"].CurrentValues.Add(paramdecs);

rv.ReportSource = CRPT;