title: LINQ query - null date
body: <p>Ive a simple linq query to return records with a null date field,
  just want to check the synatx of the "where" line is ok</p>
  
  <p>var query2 = from cs in db.tblCases
                               where cs.date_closed == null
  etc, etc, </p>
  
  <p>thanks again</p>
  
  <p>DD</p>