title: step by step problem with validation on "back" button
body: <p>I have a 3 steps forms where I bind for each step on a ViewModel that has DataAnnotation. Everything works fine except that when I click on my "previous" button, the validation gets called and, if there's missing values, the user has to fill all required fields. If I go with an action link, then the data won't be persisted. What I'm looking for here is a way to save my values without calling the validation. I also consider using cookies but I don't think that it's the best way of doing it.</p>
  
  <p>Any ideas or suggestions?</p>