title: Sum the counts with Lambda expressions
body: <p>I have a <code>List(of T)</code> where <code>T</code> has a property that is a list of checkboxes, what I need is a Lambda expression that will count all the checked checkboxes in the list.</p>
  
  <p>I tried with:</p>
  
  <pre><code>Me.list.Sum(Function(objT) objT.CheckBoxes.Where(Function(chk) chk.Checked).Count)
  </code></pre>
  
  <p>But it didn't do the trick. Any suggestions?</p>