title: How to cast IEnumerable<IEnumerable<T>> to List<List<T>>
body: <p>Is it possible to cast <code>IEnumerable&lt;IEnumerable&lt;T&gt;&gt; to List&lt;List&lt;T&gt;&gt;</code>? I am getting an invalid cast exception if i do it so.</p>
  
  <p>Thanks</p>