private void DgvKH_CellContentClick(object sender, DataGridViewCellEventArgs e) { cbbQuyen.Enabled = false; txtMaKH.Text = dgvKH.CurrentRow.Cells[0].Value.ToString(); cbbQuyen.Text = db.ConvertQuyen1(Convert.ToInt32(dgvKH.CurrentRow.Cells[9].Value.ToString())); }