title: Find TotalDays between two Datetime? variables
body: <pre><code>   DateTime? arrival = (DateTime?)(t.ArrivalDate.Value);
     DateTime? departure = (DateTime?)(t.DepartureDate);
  </code></pre>
  
  <p>Okay i know both of them are nullable and .TotalDays does not work on nullable object. So kindly tell me how am i supposed to find days difference between these two objects.</p>
  
  <p>Note:
  Both objects contains Date(s) i.e. are not null</p>