private void gridViewMain_DoubleClick(object sender, EventArgs e)
        {
            ShowPanel(3);
            CongTruong focusedRow = gridViewMain.GetFocusedRow() as CongTruong;

            textBoxMaCongTruong.Text  = focusedRow.MaCongTruong;
            textBoxTenCongTruong.Text = focusedRow.TenCongTruong;
            textBoxSoDienThoai.Text   = focusedRow.SoDienThoai;
            textBoxCaoDiem.Text       = focusedRow.CaoDiem.ToString();
            textBoxTang.Text          = focusedRow.Tang;
            textBoxKhuVuc.Text        = focusedRow.KhuVuc;
        }
        private void buttonUpdate_Click(object sender, EventArgs e)
        {
            CongTruong updated = gridViewMain.GetFocusedRow() as CongTruong;

            updated.TenCongTruong = textBoxTenCongTruong.Text;
            updated.SoDienThoai   = textBoxSoDienThoai.Text;
            if (textBoxCaoDiem.Text != String.Empty)
            {
                updated.CaoDiem = double.Parse(textBoxCaoDiem.Text);
            }
            updated.Tang   = textBoxTang.Text;
            updated.KhuVuc = textBoxKhuVuc.Text;
            try
            {
                BS_CongTruong.CapNhatCongTruong(updated);
            }
            catch (Exception exc)
            {
                MessageBox.Show("Lỗi - " + exc.Message);
            }
            ShowPanel(1);
            HienThiDuLieu_CongTruong();
        }
        private void buttonInsert_Click(object sender, EventArgs e)
        {
            CongTruong inserted = new CongTruong();

            inserted.MaCongTruong  = textBoxMaCongTruong2.Text;
            inserted.TenCongTruong = textBoxTenCongTruong2.Text;
            inserted.SoDienThoai   = textBoxSoDienThoai2.Text;
            if (textBoxCaoDiem2.Text != String.Empty)
            {
                inserted.CaoDiem = double.Parse(textBoxCaoDiem2.Text);
            }
            inserted.Tang   = textBoxTang2.Text;
            inserted.KhuVuc = textBoxKhuVuc2.Text;
            try
            {
                BS_CongTruong.ThemCongTruong(inserted);
            }
            catch (Exception exc)
            {
                MessageBox.Show("Lỗi - " + exc.Message);
            }
            ShowPanel(1);
            HienThiDuLieu_CongTruong();
        }