title: Batch update/delete EF5
body: <p>What is the best way to deal with batch updates using (Entity Framework) EF5?
  I have 2 particular cases I'm interested in:</p>
  
  <ol>
  <li><p>Updating a field (e.g. UpdateDate)  for a list (List) of between 100 and 100.000  Id's, which the primary key. Calling each update separately seem to be to much overhead and takes a long time.</p></li>
  <li><p>Inserting many, also between the 100 and 100.000, of the same objects (e.g. Users) in a single go.</p></li>
  </ol>
  
  <p>Any good advice?</p>