private bool check_ma_loai_hd_da_ton_tai()
{
US_DM_LOAI_HOP_DONG v_us = new US_DM_LOAI_HOP_DONG();
DS_DM_LOAI_HOP_DONG v_ds = new DS_DM_LOAI_HOP_DONG();
v_us.FillDataset(v_ds, "where ma_loai_hop_dong = N'" + m_txt_ma_loai_hop_dong.Text + "'");
if (m_us.strMA_LOAI_HOP_DONG != m_txt_ma_loai_hop_dong.Text && v_ds.Tables[0].Rows.Count !=0)
{
return true;
}
return false;
}