RecordOperations recordOperations = new RecordOperations();

            BodyWrapper request = new BodyWrapper();

            List<Com.Zoho.Crm.API.Record.Record> records = new List<Com.Zoho.Crm.API.Record.Record>();

            Com.Zoho.Crm.API.Record.Record record1 = new Com.Zoho.Crm.API.Record.Record();

            record1.AddKeyValue("Owner", "51857XXXXX0357001"); //if use a long type i get a error too

            records.Add(record1);

            request.Data = records;

            APIResponse<ActionHandler> response = recordOperations.UpdateRecord(recordId, moduleAPIName, request, new HeaderMap());

But I getting this error:

Exception User-Unhandled