عرض جدولين في نفس التقرير crystal report

PHP كود :
String Qstr1;
                OleDbDataAdapter dataAD;
                string Qstr2;
                OleDbDataAdapter dataAD2;
                string Qstg_sale_history;
                OleDbDataAdapter dataAD_history;

                DataSet dss = new DataSet();

                DB_Connect.Get_Connection().Open_Con();// open conn
                string ID = GV.SelectedRows[0].Cells[0].Value.ToString();

                dss.Clear();


                Qstr1 = "select * from inv_view where invoices.ID = " + ID;
                dataAD = new OleDbDataAdapter(Qstr1, DB_Connect.Get_Connection().Connection);
                dataAD.Fill(dss, "inv_view");
                dataAD.Dispose();

                Qstr2 = "select * from inv_pay where inv_id = " + ID;
                dataAD2 = new OleDbDataAdapter(Qstr2, DB_Connect.Get_Connection().Connection);
                dataAD2.Fill(dss, "inv_pay");
                dataAD2.Dispose();

                Qstg_sale_history  = "select * from sales_history_view where inv_id = " + ID;
                dataAD_history  = new OleDbDataAdapter(Qstg_sale_history, DB_Connect.Get_Connection().Connection);
                dataAD_history.Fill(dss, "sales_history_view");
                dataAD_history.Dispose();

                DB_Connect.Get_Connection().Close_Con();// Close conn

                Invoice_Rec rep = new Invoice_Rec();
                //rep.Subreports[0].DataSourceConnections.Clear();
                //rep.Subreports[0].SetDataSource(dss.Tables[2]);
                rep.SetDataSource(dss);
                Reports_form frm = new Reports_form();
                frm.CrystalReportViewer1.ReportSource = rep;
                frm.ShowDialog();
                frm.Dispose();

                dataAD.Dispose();
                dataAD2.Dispose();
                dss.Dispose();