Where/what is the private variable in auto-implemented property?
<p>There is no (explicit)  reference to a firstName private variable which FirstName is supposed to be hiding. Could you explain how this works? 
I assume there is some private variable that is being getted and setted.
Thanks.</p>

<pre><code>// auto-implemented property FirstName
public string FirstName { get; set; }
</code></pre>
