title: Allow Html Attribute Not Found [AllowHtml]
body: <p>Can anyone tell me what I need to include besides System.ComponentModel.DataAnnotations to get [AllowHtml] to be recognized?  When I add the attribute to a property it tells me the following compiler error:</p>
  
  <blockquote>
    <p><em>"The type or namespace name 'AllowHtml' could not be found (are you missing a using directive or an assembly reference?)"</em></p>
  </blockquote>
  
  <p>I need to allow html to my field and cannot continue until I get this working.  Any help would be greatly appreciated!</p>
  
  <p>Thanks...</p>