private void btnLopXoa_Click(object sender, EventArgs e) { var db = new CSDL(); if (MessageBox.Show("Bạn muốn xóa lớp " + dgvLop.CurrentRow.Cells["TenLop"].Value.ToString() + " ?", "Warning!!!", MessageBoxButtons.YesNo, MessageBoxIcon.Warning) == DialogResult.Yes) { var tenLop = dgvLop.CurrentRow.Cells["TenLop"].Value.ToString(); var idLop = dgvLop.CurrentRow.Cells["MaLop"].Value.ToString(); db.del_dataLop(idLop); MessageBox.Show("Đã xóa lớp : " + tenLop); } LoadDSLop(); }