private void btnThem_Click(object sender, EventArgs e) { // lưu, thêm active hientext(); btnLưu.Enabled = true; btnSua.Enabled = false; btnXoa.Enabled = false; btnRefresh.Enabled = false; choice_save = 1; choice_return = 1; txtMaGV.Focus(); // //if((int)GiaoVienDAO.getIDmin().Rows[0]["IDMin"]+1 <0) // dong 0 cot IDMax; // dem so dong cua IDGiaovien // rows[0] -> row[n-2] // neu ma so dang truoc kem so dang sau !=1 donvi thi tao cai ma so do +1 // vong lap for chay tu 0-> n-2; if ((int)GiaoVienDAO.countID().Rows[0]["numID"] == (int)GiaoVienDAO.getIDmax().Rows[0]["IDMax"]) { txtMaGV.Text = ((int)GiaoVienDAO.getIDmax().Rows[0]["IDMax"] + 1).ToString(); } if ((int)GiaoVienDAO.countID().Rows[0]["numID"] != (int)GiaoVienDAO.getIDmax().Rows[0]["IDMax"]) { for (int i = 1; i < (int)GiaoVienDAO.countID().Rows[0]["numID"]; i++) { if ((int)GiaoVienDAO.getID().Rows[0]["ID"] > 1) { txtMaGV.Text = ((int)GiaoVienDAO.getID().Rows[0]["ID"] - 1).ToString(); break; } if (((int)GiaoVienDAO.getID().Rows[i]["ID"] - (int)GiaoVienDAO.getID().Rows[i - 1]["ID"]) != 1) { txtMaGV.Text = ((int)GiaoVienDAO.getID().Rows[i - 1]["ID"] + 1).ToString(); break; } } } txtMaGV.Enabled = false; // txtMaMonHoc.Enabled = false; LoadComboBox(); }