TransactionScope中的异常

当我在

行运行以下代码时，得到以下异常

EntityScope<TQFormContext>.CurrentObjectContext.SaveChanges();

"与当前连接关联的事务已完成，但尚未被处置。在使用连接执行SQL语句之前，必须先处理事务。"

[TestMethod()]
    public void TransactionTest()
    {
        using (TransactionScope tc = new TransactionScope())
        {
            var u1 =  EntityScope<TQFormContext>.CurrentObjectContext.ASUsers.FirstOrDefault(u => u.UserID == 1);
            var u2 = PersistenceManager.GetById<TQ.Business.PO.Administration.UserPO>(2);
            u1.MiddleInitial = "1";
            u2.MiddleInitial = "1";
            using (SqlConnection sqlConn = new SqlConnection(ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString))
            {
                SqlCommand sqlComm = new SqlCommand("Update asusers set middleinitial='1' where userid=3", sqlConn);
                sqlConn.Open();
                sqlComm.ExecuteNonQuery();
            }
            PersistenceManager.SaveOrUpdate(u2);
            EntityScope<TQFormContext>.CurrentObjectContext.SaveChanges();
         //   throw new Exception("Blah");
            tc.Complete();
        }
    }