private void btnThem_Click(object sender, EventArgs e)
{
string tenhh = txtTenSP.Text;
soluong = Convert.ToInt32(numericUpDown2.Value.ToString());
gianhap = long.Parse(numericUpDown3.Value.ToString());
giaxuat = long.Parse(numericUpDownGX.Value.ToString());
nsx = txtNSX.Text;
thongtin = txtMoTa.Text;
string ma = hh.InsertHangHoa(tenhh, soluong, gianhap, giaxuat, nsx, thongtin);
MessageBox.Show("Thêm dữ liệu thành công !!!", "Thông báo", MessageBoxButtons.OK, MessageBoxIcon.Information);
HienThi();
if (dgvSP.SelectedRows.Count > 0)
{
dgvSPN.Rows.AddRange(new DataGridViewRow());
dgvSPN.Rows[dgvSPN.RowCount - 2].Cells[1].Value = ma;
dgvSPN.Rows[dgvSPN.RowCount - 2].Cells[2].Value = soluong;
dgvSPN.Rows[dgvSPN.RowCount - 2].Cells[3].Value = gianhap;
dgvSPN.Rows[dgvSPN.RowCount - 2].Cells[4].Value = soluong * gianhap;
}
}