title: How to initialize an event
body: <p>I have a class with an event like this</p>
  
  <pre><code>public class A
  {
      public event Func&lt;string, string&gt; Message;
  
      public void Calling()
      {
          Message("Hello world!");
      }
  }
  </code></pre>
  
  <p>If I call the <code>Calling()</code> method and no one has subscribed to the <code>Message</code> event yet, it is null and throws an exception.</p>
  
  <p>How can I initialize my event? </p>