title: Fluent Validation on List of string
body: <p>I have a list of strings and I have to define a rule to validate my ModelState in Web API. </p>
  
  <p>Each string element of this list should have length = 2 only. not greater than 2 or less than 2. </p>
  
  <p>I wrote something like this, but it is not working. </p>
  
  <pre><code>RuleFor(m =&gt; m.State.TrueForAll(x =&gt; x.Length == 2)).Equals(true);
  </code></pre>
  
  <p>could someone help me out here.</p>