title: Pointer to a class instance in C#
body: <p>Is it possible to store the reference to a class instance?</p>
  
  <pre><code>class Node
  {
      public int id;
      public int value;
      public List&lt;Node&gt; neighbours;
  }
  </code></pre>
  
  <p>How do I populate the list <code>neighbours</code> in such a way that any changes I make to a <code>Node</code> instance will be reflected there ?</p>