private void laydulieuhangdangban(string mahd) { TongTien = 0; dtdshangdangban = new DataTable(); dtdshangdangban = bd.Laydanhsachhangdangban(mahd); dgvdshangdangban.DataSource = dtdshangdangban; //dgvdshangdangban.r //for(int i =0;i<dgvdshangdangban.Rows.Count;i++) //{ // if (dtdshangdangban.Rows[i]["MaMon"].ToString() == comboBox1.SelectedValue.ToString()) // index = Convert.ToInt16(dtdshangdangban.Rows[i]["STT"]) - 1; //} for (int i = 0; i < dtdshangdangban.Rows.Count; i++) { TongTien += Convert.ToDouble(dtdshangdangban.Rows[i]["ThanhGia"].ToString()); } lbl_Thanhtien.Text = "Thành Tiền: " + String.Format("{0:0,0 vnđ}", TongTien); if (index == dtdshangdangban.Rows.Count) { index--; } if (dtdshangdangban.Rows.Count > 1) { dgvdshangdangban.Rows[0].Selected = false; dgvdshangdangban.Rows[index].Selected = true; } }