private void buttonUpdate_Click(object sender, EventArgs e)
        {
            KipNo updated = gridViewMain.GetFocusedRow() as KipNo;

            updated.TenKipNo      = textBoxTenKipNo.Text;
            updated.ThoiGianViSai = textBoxThoiGianViSai.Text;
            if (textBoxDonViTinh.Text != String.Empty)
            {
                updated.DonViTinh_KN = double.Parse(textBoxDonViTinh.Text);
            }
            if (textBoxGiaThanh.Text != String.Empty)
            {
                updated.GiaThanh_KN = double.Parse(textBoxGiaThanh.Text);
            }
            try
            {
                BS_KipNo.CapNhatKipNo(updated);
            }
            catch (Exception exc)
            {
                MessageBox.Show("Lỗi - " + exc.Message);
            }
            ShowPanel(1);
            HienThiDuLieu_KipNo();
        }
        private void buttonInsert_Click(object sender, EventArgs e)
        {
            KipNo insert = new KipNo();

            insert.MaKipNo       = textBoxMaKipNo2.Text;
            insert.TenKipNo      = textBoxTenKipNo2.Text;
            insert.ThoiGianViSai = textBoxThoiGianViSai2.Text;
            if (textBoxDonViTinh2.Text != String.Empty)
            {
                insert.DonViTinh_KN = double.Parse(textBoxDonViTinh2.Text);
            }
            if (textBoxGiaThanh2.Text != String.Empty)
            {
                insert.GiaThanh_KN = double.Parse(textBoxGiaThanh2.Text);
            }
            try
            {
                BS_KipNo.ThemKipNo(insert);
            }
            catch (Exception exc)
            {
                MessageBox.Show("Lỗi - " + exc.Message);
            }
            ShowPanel(1);
            HienThiDuLieu_KipNo();
        }
        private void gridViewMain_DoubleClick(object sender, EventArgs e)
        {
            ShowPanel(3);
            KipNo focusedRow = gridViewMain.GetFocusedRow() as KipNo;

            textBoxMaKipNo.Text       = focusedRow.MaKipNo;
            textBoxTenKipNo.Text      = focusedRow.TenKipNo;
            textBoxThoiGianViSai.Text = focusedRow.ThoiGianViSai;
            textBoxDonViTinh.Text     = focusedRow.DonViTinh_KN.ToString();
            textBoxGiaThanh.Text      = focusedRow.GiaThanh_KN.ToString();
        }