private void btn_Them_Click(object sender, EventArgs e)
 {
     try
     {
         byte[]      b  = ImageToByteArray(pct_HinhAnh.Image);
         DTO_HangHoa hh = new DTO_HangHoa(int.Parse(cboTH.SelectedValue.ToString()), int.Parse(cboLoai.SelectedValue.ToString()), txtTenHang.Text,
                                          int.Parse(txtGiaNhap.Text), int.Parse(txtDonGiaBan.Text), int.Parse(txtSLT.Text), cboDVT.Text, txtMoTa.Text, b, cbo_Size.Text, txtMauSac.Text, txtFileImage.Text);
         bs_hh.InsertHangHoa(hh);
         XtraMessageBox.Show("Thêm thành công.");
         LoadData();
     }
     catch
     {
         XtraMessageBox.Show("Thêm thất bại.");
     }
 }