in the link referenced by
"The Read action would be operating with data, thus it would return errors that are related to data operations (e.g. database error, db connection problem, etc.). Such errors would be added to the ModelState and returned by the server-side action. Please check out the article below (step7 and step8) that outlines how to return the ModelState with the respective data. "
I don't see a step 7 and step 8. The link doesn't seem to be related at all to what you are referencing. Can you provide an updated link?