title: how to return `Task<HttpResponseMessage>` as true/false value
body: <p>I want to return true/false for <code>Task&lt;HttpResponseMessage&gt;</code>, how to do this.</p>
  
  <p>Currently I'm getting below error here,</p>
  
  <blockquote>
    <p>cannot convert from 'bool' to 'System.Func&lt; System.Net.Http.HttpResponseMessage>'</p>
  </blockquote>
  
  <pre><code>private Task&lt;HttpResponseMessage&gt; PersistData()
      {
          Trace.TraceError("test");
          return new Task&lt;HttpResponseMessage&gt;(true);
      }
  </code></pre>
  
  <hr>
  
  <p>update:</p>
  
  <p>I want to return <code>Task&lt;HttpResponseMessage&gt;</code> with some empty or whatever, how to do this.</p>
  
  <pre><code>private Task&lt;HttpResponseMessage&gt; PersistData()
      {
          Trace.TraceError("test");
          //what to return here?
      }
  </code></pre>