存储过程返回值为int型，有一个参数，请问asp.net调用informix存储过程和sql存储过程有什么不同之处？

存储过程调用code:

using (OdbcConnection odbcon = new OdbcConnection(conStringCX))
                {
                    using (OdbcCommand odbcmd = new OdbcCommand("sp_investrecord", odbcon))
                    {
                        odbcmd.CommandType = CommandType.StoredProcedure;
                        OdbcParameter parm = new OdbcParameter("strdescription", cust_cityname);
                        odbcmd.Parameters.Add(parm);
                        odbcon.Open();
                        int i = odbcmd.ExecuteNonQuery();
                        return i;
                    }
       
                }        

error:ERROR [42000] [Informix][Informix ODBC Driver][Informix]A syntax error has occurred.