For a current MVC3 project I have a model that has multiple pages for input. The object is set up with required fields however they’re on different pages. This means I can’t do a simple check on ModelState.IsValid. Instead I check if the current page has all the values it needs before allowing the user on to the next. This doesn’t seem ideal.
One of the main things that I don’t like is the fact that having required fields on a page other than the first means the postback and overall validation failure has already happened so any required fields on the next page are already marked in error state even though the user has never been to the page.
Are there any best practices for validation of an entity with multiple input pages that have required fields on them?
You should use view models instead of your domain models. Soy you could split your domain model into multiple view models for each step of the wizard. Here’s another answer you might find useful.