private DataTable get_trang_thai_lao_dong_ket_thuc() { US_GD_TRANG_THAI_LAO_DONG v_us = new US_GD_TRANG_THAI_LAO_DONG(); DataSet v_ds = v_us.LayDanhSachKetThucTTLDTrongThang(); return v_ds.Tables[0]; }