BangPhanLoaiLaoDong() публичный метод

public BangPhanLoaiLaoDong ( System.DateTime ip_dat_tai_ngay ) : DataTable
ip_dat_tai_ngay System.DateTime
Результат System.Data.DataTable
 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();
     }
 }