This post about entity-level validation is part of Jeff Handley's series on
RIA Services Validation.
Source: Jeff Handley's Blog
In my last post, I went over some cross-field validation scenarios and provided some sample code, including a CompareValidatorAttribute. We’ve now covered single-field validation and cross-field validation, but there’s yet another level of validation supported by RIA Services—Entity-Level validation. As you’ll see in this post, entity-level validation is very similar to what we’ve already seen.