CrystalDecisions.CrystalReports.Engine.ReportDocument report = new     CrystalDecisions.CrystalReports.Engine.ReportDocument();
                report.Load(Environment.CurrentDirectory + "\\StampaTemperatura.rpt");
                
                CrystalDecisions.Shared.TableLogOnInfo logOnInfo = new CrystalDecisions.Shared.TableLogOnInfo();
                logOnInfo.ConnectionInfo.ServerName = Environment.CurrentDirectory + "\\StampaDati.xml";
                report.Database.Tables[0].ApplyLogOnInfo(logOnInfo);
                
                
                crystalReportViewer1.ReportSource = report;
                crystalReportViewer1.RefreshReport();