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

            updated.TenPPNo      = textBoxTenPPNo.Text;
            updated.MaCongTruong = textBoxMaCongTruong.Text;
            if (textBoxHeSoKienCo.Text != String.Empty)
            {
                updated.HeSoKienCo = double.Parse(textBoxHeSoKienCo.Text);
            }
            if (textBoxHeSoPPNo.Text != String.Empty)
            {
                updated.HeSoPPNo = double.Parse(textBoxHeSoPPNo.Text);
            }
            try
            {
                BS_PhuongPhapNo.CapNhatPhuongPhapNo(updated);
            }
            catch (Exception exc)
            {
                MessageBox.Show("Lỗi - " + exc.Message);
            }
            ShowPanel(1);
            HienThiDuLieu_PhuongPhapNo();
        }
        private void buttonInsert_Click(object sender, EventArgs e)
        {
            PhuongPhapNo inserted = new PhuongPhapNo();

            inserted.MaPPNo       = textBoxMaPPNo2.Text;
            inserted.TenPPNo      = textBoxTenPPNo2.Text;
            inserted.MaCongTruong = textBoxMaCongTruong2.Text;
            if (textBoxHeSoKienCo2.Text != String.Empty)
            {
                inserted.HeSoKienCo = double.Parse(textBoxHeSoKienCo2.Text);
            }
            if (textBoxHeSoPPNo2.Text != String.Empty)
            {
                inserted.HeSoPPNo = double.Parse(textBoxHeSoPPNo2.Text);
            }
            try
            {
                BS_PhuongPhapNo.ThemPhuongPhapNo(inserted);
            }
            catch (Exception exc)
            {
                MessageBox.Show("Lỗi - " + exc.Message);
            }
            ShowPanel(1);
            HienThiDuLieu_PhuongPhapNo();
        }
        private void gridViewMain_DoubleClick(object sender, EventArgs e)
        {
            ShowPanel(3);
            PhuongPhapNo focusedRow = gridViewMain.GetFocusedRow() as PhuongPhapNo;

            textBoxMaPPNo.Text       = focusedRow.MaPPNo;
            textBoxTenPPNo.Text      = focusedRow.TenPPNo;
            textBoxMaCongTruong.Text = focusedRow.MaCongTruong;
            textBoxHeSoKienCo.Text   = focusedRow.HeSoKienCo.ToString();
            textBoxHeSoPPNo.Text     = focusedRow.HeSoPPNo.ToString();
        }