How do I pass parameter to crystal report ?

ReportDocument cryRpt = new ReportDocument();
cryRpt.Load(@"C:\Users\arash\Desktop\WindowsFormsApplication1\Jeton.rpt");
cryRpt.SetParameterValue("test", "،this is a test");
cryRpt.Refresh(); 
cryRpt.PrintToPrinter(1, true, 1, 1);