title: Task type in a IBackgroundTask class
body: <p>I want to do</p>
  
  <pre><code>async Task DoSomething()
  {
     await SomeAsyncAPI();
  }
  
  async void Run()
  {
     await DoSomething();
     DoAnother();
  }
  </code></pre>
  
  <p>but Task type is not allowed in IBackgroundTask class. I want DoAnother() run after DoSomething completed.</p>