title: Get the sum after a linq join
body: <p>I'm using this linq query to get a list of doubles. The list looks correct, but now I need to total the doubles in the list.</p>
  
  <pre><code>        var total = from sauId in schools
                                      join item in entities.AmountTable
                                      on sauId equals item.sauId
                                      select item.amount;
  </code></pre>