title: check on overlapping dates (vb.net)
body: <p>in a program I'm writing I'm creating some objects with a start date (with a datepicker) and an end date (also with a datepicker). 
  Now I need to check if this object's date range overlaps with any other object's date range stored in the database. If it does I can't save it in the database but if it doesn't I can.</p>
  
  <p>Anyone has an idea how to do this?</p>