http://blogs.msdn.com/b/andrewarnottms/archive/2011/08/22/read-only-frozen-and-immutable-types-and-collections.aspx[Update: a more recent post with new data on attainable performance of immutable collections ] The topics of immutability and functional programming has fascinated me lately. Mostly because of my work on the Visual Studio Common Project System (CPSen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)http://blogs.msdn.com/b/andrewarnottms/archive/2011/08/22/read-only-frozen-and-immutable-types-and-collections.aspx#10359215Fri, 12 Oct 2012 18:26:32 GMT91d46819-8472-40ad-a661-2c78acb4018c:10359215Andrew L Arnott<p>Yes, thanks for the typo notice. &nbsp;I&#39;ve corrected it.</p> <div style="clear:both;"></div><img src="http://blogs.msdn.com/aggbug.aspx?PostID=10359215" width="1" height="1">http://blogs.msdn.com/b/andrewarnottms/archive/2011/08/22/read-only-frozen-and-immutable-types-and-collections.aspx#10321304Mon, 18 Jun 2012 11:11:23 GMT91d46819-8472-40ad-a661-2c78acb4018c:10321304Exit Music<p>Under the performance section, you say &quot;Before you write off mutable collections&quot;, when I think you mean &quot;Before you write off immutable collections&quot;.</p> <p>Am I write (I&#39;m funny aren&#39;t I?) in thinking this? I&#39;m not too clued up on this subject, and this part was a source of confusion for me.</p> <div style="clear:both;"></div><img src="http://blogs.msdn.com/aggbug.aspx?PostID=10321304" width="1" height="1">http://blogs.msdn.com/b/andrewarnottms/archive/2011/08/22/read-only-frozen-and-immutable-types-and-collections.aspx#10200453Thu, 25 Aug 2011 17:33:27 GMT91d46819-8472-40ad-a661-2c78acb4018c:10200453Anonymous<p>The data storage topic grabbed my attention; it may be interesting to evaluate benefits of special, uncommon data structures in context-specific applications.</p> <div style="clear:both;"></div><img src="http://blogs.msdn.com/aggbug.aspx?PostID=10200453" width="1" height="1">