asp.net调用oracle存储过程

DataTable dt = new DataTable();
            OracleParameter[] paras = new OracleParameter[5];
            paras[0] = new OracleParameter("p_StartTime", OracleType.Char);
            paras[0].Value = StartTime;
            paras[1] = new OracleParameter("p_EndTime", OracleType.Char);
            paras[1].Value = EndTime;
            paras[2] = new OracleParameter("P_SelectStr", OracleType.VarChar);
            paras[2].Value = SelectStr;
            paras[3] = new OracleParameter("p_SubStation", OracleType.Char);
            paras[3].Value = SubID;
            paras[4] = new OracleParameter("io_cursor", OracleType.Cursor);
            paras[4].Direction = ParameterDirection.Output;
            dt = DBHelper.ExecuteTable("datacheck_handcheck.dc_handcheck_apsel", CommandType.StoredProcedure, paras);
            return dt;