title: filtering objects by inner collection property value - LINQ, C#
body: <p>I haven't used LINQ for a while and things got forgotten.</p>
  <p>How would one filter panelInfoModels by Exists value? The query below returns the same collection (does not apply intended filtering).</p>
  <pre><code>var q = (from p in panelInfoModels
                              from u in p.UUTInfo
                              where u.Exists == false
                              select p).ToList();
  </code></pre>
  <p>Thanks</p>