asp.net中如何调取数据库中存储过程输出的两个变量

 public DataTable GetList_GenqtyNumPrice(int _peoid, int _genstorageid,int _goodsid)
        {
            DataSet ds = new DataSet();
            OracleParameter[] parameters ={
                        new OracleParameter("peoid_in",OracleType.Int32,22),
                        new OracleParameter("genstorageid_in",OracleType.Int32,22),
                        new OracleParameter("Goods_id_in",OracleType.Int32,22),
                        new OracleParameter("GENQTY_out",OracleType.Number),
                        new OracleParameter("avgprice_out",OracleType.Number)
                                          };
            parameters[0].Value = _peoid;
            parameters[1].Value = _genstorageid;
            parameters[2].Value = _goodsid;
            parameters[3].Direction = ParameterDirection.Output;
            parameters[4].Direction = ParameterDirection.Output;
 

            DbHelperOra.RunProcedure("PACK_COMM.P_GetGenqtyNumPrice", parameters, "dt");

            DataTable dt = new DataTable();
            //创建表中的列
            dt.Columns.Add("GENQTY_out");
            dt.Columns.Add("avgprice_out");
            DataRow row = dt.NewRow();
            //给列赋值
            row["GENQTY_out"] = parameters[3].Value.ToString();
            row["avgprice_out"] = parameters[4].Value.ToString();
            //把有值的列添加到表
            dt.Rows.Add(row);
            return dt;
        }