private void load_data_to_grid()
 {
     US_DUNG_CHUNG v_us = new US_DUNG_CHUNG();
     DataSet v_ds = new DataSet();
     v_ds.Tables.Add(new DataTable());
     v_us.FillDatasetVNghiepVuMonHoc(v_ds);
     m_grc.DataSource = v_ds.Tables[0];
 }