http://blogs.msdn.com/cyrusn/archive/2004/05/16/132955.aspxTurns out there was an even simpler way to write a concrete implementation of ICollection: namespace Testing.Collections { public class EmptyCollection &lt;A&gt; : ICollection &lt;A&gt; { public EmptyCollection () { } #region ICollection&lt;A&gt; Membersen-USCommunityServer 2.1 SP1 (Build: 61025.2)http://blogs.msdn.com/cyrusn/archive/2004/05/16/132955.aspx#133737Tue, 18 May 2004 02:13:00 GMT91d46819-8472-40ad-a661-2c78acb4018c:133737Julien Couvreur (Dumky)&quot;Couvreur&quot; ;-)http://blogs.msdn.com/cyrusn/archive/2004/05/16/132955.aspx#460117Fri, 02 Sep 2005 21:31:53 GMT91d46819-8472-40ad-a661-2c78acb4018c:460117SofiaVeri nice site!http://blogs.msdn.com/cyrusn/archive/2004/05/16/132955.aspx#9674470Mon, 01 Jun 2009 07:07:40 GMT91d46819-8472-40ad-a661-2c78acb4018c:9674470 Cyrus Blather Writing the simplest code Part2 | My Site<p>PingBack from <a rel="nofollow" target="_new" href="http://patiochairsite.info/story.php?id=345">http://patiochairsite.info/story.php?id=345</a></p>