title: DateDifference on VSTO C#
body: <pre><code>differencedate = mspApp.DateDifference(task.BaselineStart, tsv.StartDate, mspApp.ActiveProject.Calendar);
  System.Windows.Forms.MessageBox.Show(differencedate.ToString());
  </code></pre>
  
  <p>no result is shown, the messagebox did not display. I have tried different solutions like converting the parameters to DateTime. Weird part is, the IDE shows the syntax and parameters needed to run this function.</p>