title: System.ComponentModel.DataAnnotations MaxLength not showing
body: <p>I have created a separate class library to hold all my model objects. This is due to there being two sites, but needing the same model objects and validation that comes with it. Instead of copying and pasting the code in two places I thought I could just add the to a library. Everything looks great apart from MaxLength, it won't show up when I add System.ComponentModel.DataAnnotations</p>
  
  <p>Yes, I have added a reference but nothing seems to get it to work like it does in a web solution.</p>