private void load_data_to_sle_ma_lcd()
{
US_CM_DM_TU_DIEN v_us = new US_CM_DM_TU_DIEN();
DS_CM_DM_TU_DIEN v_ds = new DS_CM_DM_TU_DIEN();
v_us.FillDatasetByIdLoaiTuDien(v_ds, 3);
m_sle_ma_lcd.Properties.DataSource = v_ds.Tables[0];
m_sle_ma_lcd.Properties.DisplayMember = CM_DM_TU_DIEN.TEN;
m_sle_ma_lcd.Properties.ValueMember = CM_DM_TU_DIEN.ID;
//m_sle_chuc_danh_lns.EditValue = null;
//m_sle_ma_lcd.Properties.NullText = "--Chọn mã--";
}