It’s been a while since I’ve posted and I’m trying to get back into the swing of things again. I don’t really have a lot to say about the problem, just yet. We’ve identified some breaking changes with ASP.Net MVC 2.0 RC 2.

RC 2 switches to relying on all data annotations on the model when doing validation, when previous releases only checked the values posted and properly bound to a model. To be honest, initially, I didn’t like that idea. It was confusion to me why my model was attributed with attributes requiring fields, but validation was not happening as I expected.

Over time, I came to appreciate, and apparently exploit this feature to do conditional validation. Since the form only posts the enabled controls, I was able to simply enable/disable inputs and doing so, enable/disable their required attribute for model validation.

Everything worked great, until things changed in RC2.

You can read more about the decision to make the switch.