http://blogs.msdn.com/b/brada/archive/2003/04/17/49977.aspxYup Shawn has it pretty much right on . Both System.Enum and System.ValueType are themselves reference types. We added them to the system for two primary reasons: 1. We wanted to provide developers an easy way to group all ValueTypes and allen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)http://blogs.msdn.com/b/brada/archive/2003/04/17/49977.aspx#207181Tue, 03 Aug 2004 17:04:00 GMT91d46819-8472-40ad-a661-2c78acb4018c:207181Mark HoffmanThank heavens for Google! <br> <br>I was adding some sorting capabilities into one of my classes today and received the compiler error when I tried to cast a member of my enum to IComparable. I was like &quot;What the...Enum implements IComparable! Why can't I cast it!?!&quot; <br> <br>A quick Google search for &quot;icomparable enum&quot; led me here and to the solution of the additional cast to Enum. Works perfectly! <br><div style="clear:both;"></div><img src="http://blogs.msdn.com/aggbug.aspx?PostID=207181" width="1" height="1">http://blogs.msdn.com/b/brada/archive/2003/04/17/49977.aspx#49978Fri, 18 Apr 2003 03:39:00 GMT91d46819-8472-40ad-a661-2c78acb4018c:49978Shawn A. Van NessInteresting stuff -- thanks for providing some closure to my ramblings, Brad!<div style="clear:both;"></div><img src="http://blogs.msdn.com/aggbug.aspx?PostID=49978" width="1" height="1">