title: Remove a dynamically added event handler
body: <p>I have a code like:</p>
  
  <pre><code>button1.Click += (s, e) =&gt;
  {
  
  };
  </code></pre>
  
  <p>Now how is it possible to remove this handler dynamically? something like:</p>
  
  <pre><code>button1.Click = null;
  </code></pre>