title: How to pass Model Value through ActionLink
body: <p>I have a simple model which models a vehicle entity.
  It has attributes:
  Model
  Make
  Colour
  RegistrationPlate</p>
  
  <p>On the create View I want to users to be able to perform a server look up using the registration plate to auto fill the Model/Make/Colour information.</p>
  
  <p>As such I'm trying to create an action link like so:</p>
  
  <pre><code>@Html.ActionLink("Look up registration", "RegLookup", "Vehicle", Model.Registration)
  </code></pre>
  
  <p>Where RegLookup is a get ActionResult method in the vehicle controller which goes away and finds the model/make/colour information based on the registration field passed through to it.  The Make/Model/Colour information is retrieved from a separate database.</p>
  
  <p>However at present on rendering the view - before even getting to the action link - an exception is thrown indicating that the Model is Null.</p>
  
  <p>What I want to be passed through is effectively the value from the textbox representing the registration:</p>
  
  <pre><code>@Html.EditorFor(model =&gt; model.Registration)
  </code></pre>
  
  <p>How do I pass this value through?</p>