title: Can a class derived from a Linq to SQL entity still be saved?
body: <p>Say "Foo" is a Linq to SQL entity created in the Linq to SQL designer.</p>
  
  <p>I then have "Bar" which derives from "Foo".</p>
  
  <p>Should I be able to save "Bar" using Linq to SQL (assuming I don't care abut saving any of the extra properties on Bar).</p>
  
  <pre><code>        using (myDataContext ctx = new myDataContext())
          {
              ctx.Foos.InsertOnSubmit(instanceOfBar);
              ctx.SubmitChanges();
          }
  </code></pre>
  
  <p>Is this supposed to be supported?</p>
  
  <p>Thanks much,
  Jon</p>