//private void buttonhienthi_Click(object sender, EventArgs e)
        //{
        //    String nv = comboBox1.SelectedValue.ToString();
        //    GiaoDienCuaHang.DataLayer.PhieuDatHangData pdh1 = new GiaoDienCuaHang.DataLayer.PhieuDatHangData();
        //    CrystalReportPhieudathang report = new CrystalReportPhieudathang();

        //    report.SetDataSource(pdh1.LayDS_PDH(nv));
        //    report.SetParameterValue("tennv", comboBox1.Text);


        //    crystalReportViewer1.ReportSource = report;
        //}

        private void frmThongKePhieuDatHang_Load(object sender, EventArgs e)
        {
            GiaoDienCuaHang.DataLayer.NhaCungCapData nccdata = new GiaoDienCuaHang.DataLayer.NhaCungCapData();
            comboBox1.DataSource    = nccdata.LayDSNhaCungCap();
            comboBox1.DisplayMember = "TENNCC";
            comboBox1.ValueMember   = "MANCC";
        }
        private void frmThongKeNhaCungCap_Shown(object sender, EventArgs e)
        {
            GiaoDienCuaHang.DataLayer.NhaCungCapData ncc = new GiaoDienCuaHang.DataLayer.NhaCungCapData();
            DataTable TBL = ncc.LayDSNhaCungCap();
            CrystalReportNhaCungCap report = new CrystalReportNhaCungCap();

            report.SetDataSource(TBL);
            crystalReportViewer1.ReportSource = report;
        }