ASP.NET MVC 3 Remote Validation set custom error message

Question

Is there any way to set different errors according with logic in MVC 3.0 remote validation

public ActionResult IsUserEmailExists(string email)
        {
             


        

Answer 1

You could return the error message instead of a boolean value:

return Json("Some custom error message", JsonRequestBehavior.AllowGet);

In this case the model will be considered invalid (the same as if you had returned false) and the string used as error message.