/// <summary>
        /// Trả về danh sách các nhân viên được quyền chọn theo user người sử dụng
        /// </summary>
        /// <param name="ip_id_user"></param>
        public static void load_data_2_cbo_nhan_vien(
            decimal ip_dc_id_user
            , System.Windows.Forms.ComboBox op_cbo_nhan_vien_thu
            )
        {
            DS_V_HT_NGUOI_SU_DUNG v_ds = new DS_V_HT_NGUOI_SU_DUNG();
            US_V_HT_NGUOI_SU_DUNG v_us = new US_V_HT_NGUOI_SU_DUNG();
            if (US_V_HT_NGUOI_SU_DUNG.isInAdminGroup(ip_dc_id_user))
            {

                v_us.FillDataset(v_ds);
                DataRow v_dr = v_ds.V_HT_NGUOI_SU_DUNG.NewRow();
                v_dr[V_HT_NGUOI_SU_DUNG.ID] = -1;
                v_dr[V_HT_NGUOI_SU_DUNG.TEN_TRUY_CAP] = "All";
                v_dr[V_HT_NGUOI_SU_DUNG.TEN] = "--Tất cả---";
                v_dr[V_HT_NGUOI_SU_DUNG.MAT_KHAU] = 123;
                v_dr[V_HT_NGUOI_SU_DUNG.NGAY_TAO] = "2015-01-20";
                v_dr[V_HT_NGUOI_SU_DUNG.NGUOI_TAO] = "ADMIN";
                v_dr[V_HT_NGUOI_SU_DUNG.TRANG_THAI] = "0";
                v_dr[V_HT_NGUOI_SU_DUNG.BUILT_IN_YN] = "Y";
                v_dr[V_HT_NGUOI_SU_DUNG.ID_USER_GROUP] = 3;
                v_ds.V_HT_NGUOI_SU_DUNG.Rows.InsertAt(v_dr, 0);
            }
            else
            {
                v_us.FillDataset(v_ds, "where ID=" + ip_dc_id_user.ToString());
            }
            op_cbo_nhan_vien_thu.DataSource = v_ds.V_HT_NGUOI_SU_DUNG;
            op_cbo_nhan_vien_thu.DisplayMember = V_HT_NGUOI_SU_DUNG.TEN;
            op_cbo_nhan_vien_thu.ValueMember = V_HT_NGUOI_SU_DUNG.ID;

            op_cbo_nhan_vien_thu.SelectedIndex = 0;
        }