public void NguyenLieu_Delete() { NguyenLieuDTO nguyenlieu = new NguyenLieuDTO(); nguyenlieu.MaNl = cbnguyenlieu.SelectedValue.ToString(); DataTable dt = nguyenlieu_bus.NguyenLieu_Delete(nguyenlieu); MessageBox.Show(dt.Rows[0][0].ToString(), "Thông báo", MessageBoxButtons.OK); }