title: Partial Class Declaration Error in MonoTouch Hello World tutorial
body: <p>I'm trying out the Hello World tutorial in the MonoTouch Trial version and I have put in all the code and attempted a build.</p>
  
  <p>In the <code>designer.cs</code> file, the line</p>
  
  <pre><code>partial void actBtn (MonoTouch.Foundation.NSObject sender)
  </code></pre>
  
  <p>gives an error of</p>
  
  <blockquote>
    <p>A partial method 'HelloWorld_iPhone.HelloWorld_iPhoneViewController.actBtn (MonoTouch.Foundation.NSObject sender)' implementation is missing a partial method declaration.</p>
  </blockquote>
  
  <p>What did I miss?</p>
  
  <p>I should add that this line was inserted automatically by MonoTouch - I only wrote the single line of method code which follows.</p>