BKI_DichVuMatDat.US.US_DM_NHAN_VIEN.BangPhanLoaiLaoDong C# (CSharp) Method

        public DataTable BangPhanLoaiLaoDong(DateTime ip_dat_tai_ngay)
        {
            CStoredProc v_sp = new CStoredProc("pr_RPTTH_phan_loai_nhan_vien");
            v_sp.addDatetimeInputParam("@ip_dat_tai_ngay", ip_dat_tai_ngay);

            DataSet v_ds_op = new DataSet();
            v_ds_op.Tables.Add();

            v_sp.fillDataSetByCommand(this, v_ds_op);
            return v_ds_op.Tables[0];
        }

 private void load_data_to_grid()
 {
     //SplashScreenManager.ShowForm(typeof(F_wait_form));
     try
     {
         US_DM_NHAN_VIEN v_us = new US_DM_NHAN_VIEN();
         m_tree_don_vi.ParentFieldName = DM_DON_VI.ID_DON_VI_CAP_TREN;
         m_tree_don_vi.DataSource = v_us.BangPhanLoaiLaoDong(lay_ngay());
         m_tree_don_vi.ExpandAll();
     }
     catch(Exception)
     {
         throw;
     }
     finally
     {
         //SplashScreenManager.CloseForm();
     }
 }