Syntax Guide

((long?)(hhRoster.FirstorDefault(x => x.relationship == 1)?.maritalstatus)?? 0) == self
I copy this from a public questionnaire and intend to use it but it gives error. Any help.
where can i get a complete syntax guide for all the functions and reserved words supported by survey solutions.

We have support portal

Each type of auestion has it’s own syntax guide,

for example, for barcode question there is a separate article:

also you have to read about data types:

Best regards,

Survey Solutions Team support