public virtual CrystalDecisions.CrystalReports.Engine.ReportDocument CreateReport()
        {
            CrystalReportPhieuDatHang rpt = new CrystalReportPhieuDatHang();

            rpt.Site = this.Site;
            return(rpt);
        }
        private void buttonhienthi_Click(object sender, EventArgs e)
        {
            String cc = comboBox1.SelectedValue.ToString();

            GiaoDienCuaHang.DataLayer.PhieuDatHangData pdh1 = new GiaoDienCuaHang.DataLayer.PhieuDatHangData();
            CrystalReportPhieuDatHang parameter             = new CrystalReportPhieuDatHang();

            parameter.SetDataSource(pdh1.LayDS_PDH(cc));
            parameter.SetParameterValue("tenncc", comboBox1.Text);
            crystalReportViewer1.ReportSource = parameter;
        }