title: What is this event?
body: <p>Could someone explain what this C# code is doing?</p>
  
  <pre><code>// launch the camera capture when the user touch the screen
  this.MouseLeftButtonUp += (s, e) =&gt; new CameraCaptureTask().Show();
  
  // this static event is raised when a task completes its job
  ChooserListener.ChooserCompleted += (s, e) =&gt;
  {
      //some code here
  };
  </code></pre>
  
  <p>I know that <strong>CameraCaptureTask</strong> is a class and has a public method <strong>Show()</strong>. What kind of event is this? what is <code>(s, e)</code>?</p>