title: how many days between two selected dates
body: <blockquote>
    <p><strong>Possible Duplicate:</strong><br>
    <a href="https://stackoverflow.com/questions/2330302/days-difference-between-two-dates">Days difference between two dates</a>  </p>
  </blockquote>
  
  
  
  <p>I need to know how many days between two selected dates.
  typically for comparing dates I use DateTime.CompareTo, but here the situation is different.
  thanks in advance and sorry for stupid question.</p>