title: bulk delete in entity framework
body: <p>I'd like to bulk delete records from a table using linq.
  There's a post that describes how to do it:
  <a href="https://stackoverflow.com/questions/869209/bulk-deleting-in-linq-to-entities/870081#870081">Bulk-deleting in LINQ to Entities</a></p>
  
  <pre><code>var query = from c in ctx.Customers
              where c.SalesPerson.Email == "..."
              select c;
  
  query.Delete();
  </code></pre>
  
  <p>But the function "Delete" doesn't exist in my var variable.
  <br>
  Furthermore, the function "SubmitChanges" doesn't exist on my context.</p>