title: async Methods correct? Resharper warning
body: <p>in my Method <code>RecalcChartAsync</code> i do some time intensive stuff.. so i thought i'll do some things async.</p>
  
  <p>I want to start the two Methods <code>CreateHistogramAsync</code> <code>CalculatePropValuesAsync</code> and in the meanwhile do some stuff in my <code>RecalcChartsAsync</code> and finally wait for it to complete.</p>
  
  <pre><code> private async void RecalcChartsAsync()
  {
      var histogram = CreateHistogramAsync();
      var propValues = CalculatePropValuesAsync();
  
      //do some other stuff
  
      await histogram;
      await propValues;
  }
  
  private async Task CreateHistogramAsync()
  {
      //do some stuff
  }
  
  private async Task CalculatePropValuesAsync()
  {
      //do some stuff
  }
  </code></pre>
  
  <p>Im not sure if i am doing it the right way because ReSharper gives me the following warning at the async Keyword at CreateHistogramAsync and CalculatePropValueAsync:</p>
  
  <blockquote>
    <p>This async method lacks 'await' operators and will run synchronously. Consider using the await operator to await non-blocking API calls, ...</p>
  </blockquote>
  
  <p>Now i am not sure if i am using this async thing in the correct way.</p>