title: Enterprise Library Validation Block - Validate nullable properties?
body: <p>I am trying to come up with a validation for a nullable property, like int.</p>
  
  <p>Example</p>
  
  <pre><code>[RangeValidator(0, RangeBoundaryType.Inclusive, 1, RangeBoundaryType.Inclusive)]
  int? Age { get; set; }
  </code></pre>
  
  <p>However if I set <code>Age</code> to null validation fails because it doesn't fall in the range, I know I need an <code>[ValidatorComposition(CompositionType.Or)]</code> as well, but what else should I use? </p>