public void AddDr(DataTable dr,string clientName)
        {
            DataTable ptemp = this.getDtByName(clientName);
            for (int tempi = 0; tempi < ptemp.Rows.Count; tempi++)
            {

                //递归查找子公司
                if (!string.IsNullOrEmpty(ptemp.Rows[0][2].ToString()))
                {
                    AddDr(dr, ptemp.Rows[0][2].ToString());   //使用递归的方式,继续查找当前公司的父公司信息
                }
                DataRow subdr = dr.NewRow();
                for (int tempj = 0; tempj < ptemp.Columns.Count; tempj++)
                {
                    subdr[tempj] = ptemp.Rows[tempi][tempj].ToString();
                }
                dr.Rows.Add(subdr);

            }
        }
如上述的递归中，使用后，就进入了死循环，请问，该如何改进呢？