public frmReport(string ReportFileName, DataTable Table, ReportParameter[] Params)
      : this() {
      rvMain.LocalReport.DataSources.Add(new ReportDataSource("DataSet1_" + Table.TableName, Table));
      rvMain.ZoomMode = ZoomMode.FullPage;
      rvMain.LocalReport.ReportPath = ReportFileName;
      rvMain.LocalReport.SetParameters(Params);
      rvMain.SetDisplayMode(DisplayMode.PrintLayout);
    }