强类型DataSet的回滚

        public int insertVolunteer(string VOLUNTEERUUID, string DOCUEMENTTYPE, string DOCUMENTNUMBER, string UnitUUID, ref string VOLUNTEERSERIALNO)
        {
            OrganizationBLL ob = new OrganizationBLL();
            riTA = new REGIONINFOTableAdapter();
            REGIONVOLUNTEERTableAdapter rvTA = new REGIONVOLUNTEERTableAdapter();
            int rtn = 0;
            vbiTA.Connection.Open();
            rvTA.Connection.Open();
            riTA.Connection.Open(); 

            vbiTA.Transaction = vbiTA.Connection.BeginTransaction();
            rvTA.Transaction = rvTA.Connection.BeginTransaction();
            riTA.Transaction = riTA.Connection.BeginTransaction();

            try
            {

                string tob = Convert.ToString(riTA.GetCurrentSerialNo(UnitUUID));
                if (!string.IsNullOrEmpty(tob))
                {
                    VOLUNTEERSERIALNO = tob;
                }
                else
                {
                    VOLUNTEERSERIALNO = ob.GetRegionInfoByUnitID(UnitUUID)[0].REGPIX.PadRight(13, '0');
                }
                VOLUNTEERSERIALNO = VOLUNTEERSERIALNO.Substring(0, 10) + volNoProcess(VOLUNTEERSERIALNO.Substring(10, 3));
                if (VOLUNTEERSERIALNO.Length < 13)
                {
                    throw new NullReferenceException();
                }

                if (riTA.UpdataCurrentSerialNo(VOLUNTEERSERIALNO, UnitUUID) < 1)
                {
                    throw new NullReferenceException();
                }

                if (vbiTA.InsertQueryNoData(
                VOLUNTEERUUID,
                DOCUEMENTTYPE,
                DOCUMENTNUMBER,
                VOLUNTEERSERIALNO,
                -1,
                DateTime.Now,
                DateTime.Now
                ) < 1)
                {
                    throw new NullReferenceException();
                }

                if (rvTA.InsertQuery(UnitUUID, VOLUNTEERUUID, DateTime.Now, null, null, null, null, null) < 1)
                {
                    throw new NullReferenceException();
                }
                vbiTA.Transaction.Commit();
                rvTA.Transaction.Commit();
                riTA.Transaction.Commit();
                rtn = 1;
            }
            catch
            {
                vbiTA.Transaction.Rollback();
                rvTA.Transaction.Rollback();
                riTA.Transaction.Rollback();
            }
            finally
            {
                vbiTA.Connection.Close();
                rvTA.Connection.Close();
                riTA.Connection.Close();
            }
            return rtn;

        }