title: Find item in IList with LINQ
body: <p>I have an IList:</p>
  
  <pre><code>IList list = CallMyMethodToGetIList();
  </code></pre>
  
  <p>that I don't know the type I can get it</p>
  
  <pre><code>Type entityType = list[0].GetType();`
  </code></pre>
  
  <p>I would like to search this list with LINQ something like:</p>
  
  <pre><code>var itemFind = list.SingleOrDefault(MyCondition....);
  </code></pre>
  
  <p>Thank you for any help. </p>