m_txt_tu_khoa.ForeColor = Color.Gray;
            }
        }

        private void update_v_dm_co_so_dinh_muc()
        {
            if (!CGridUtils.IsThere_Any_NonFixed_Row(m_grv_co_so_dinh_muc)) return;
            if (!CGridUtils.isValid_NonFixed_RowIndex(m_grv_co_so_dinh_muc, m_grv_co_so_dinh_muc.Row)) return;
            grid2us_object(m_us, m_grv_co_so_dinh_muc.Row);
            this.panel1.PerformLayout();
            this.ResumeLayout(false);
        }

        private void insert_v_dm_co_so_dinh_muc()
        {