private void btSuaPC_Click(object sender, EventArgs e) { if (txtMaPC.Text == "" || txtTenPC.Text == "" || txtTienPC.Text == "") { MessageBox.Show("Khong co du lieu"); return; } PhuCap pc = new PhuCap(txtMaPC.Text, txtTenPC.Text, int.Parse(txtTienPC.Text)); try { cnb.UpdatePhuCap(pc); } catch (Exception p) { MessageBox.Show(p.ToString()); } }