http://blogs.msdn.com/b/alexj/archive/2010/02/13/tip-54-how-to-improve-performance-using-statement-expressions.aspxBackground: While writing the update post in my Data Service Provider series I ended up writing this block of reflection code to copy properties values from one object to another: foreach (var prop in resourceType .Properties .Where(p =&gt; (p.Kind &amp;en-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)http://blogs.msdn.com/b/alexj/archive/2010/02/13/tip-54-how-to-improve-performance-using-statement-expressions.aspx#9963674Mon, 15 Feb 2010 16:38:58 GMT91d46819-8472-40ad-a661-2c78acb4018c:9963674Alex D James<p>@John </p> <p>I've got no perf numbers specific to this technique, but it should be a significant difference, its essentially the difference between normal code (once the expression is compiled) and reflection.</p> <p>Alex</p> <div style="clear:both;"></div><img src="http://blogs.msdn.com/aggbug.aspx?PostID=9963674" width="1" height="1">http://blogs.msdn.com/b/alexj/archive/2010/02/13/tip-54-how-to-improve-performance-using-statement-expressions.aspx#9963582Mon, 15 Feb 2010 15:12:17 GMT91d46819-8472-40ad-a661-2c78acb4018c:9963582John<p>Curious if you have performance numbers using Expressions over the nested reflection</p><div style="clear:both;"></div><img src="http://blogs.msdn.com/aggbug.aspx?PostID=9963582" width="1" height="1">