http://blogs.msdn.com/b/pakistan/archive/2013/01/20/immutable-collection-addition-in-net-4-5.aspxThe BCL team has recently released preview of the Immutable collection for .NET 4.5 and Windows Store apps and can be acquired as NuGet package . When I delved in this topic I stumbled upon a really cool Channel 9 video discussing Immutable Collectionen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)http://blogs.msdn.com/b/pakistan/archive/2013/01/20/immutable-collection-addition-in-net-4-5.aspx#10387644Wed, 23 Jan 2013 17:41:27 GMT91d46819-8472-40ad-a661-2c78acb4018c:10387644Anna <p>Great content! I think Syncfusion&#39;s free e-book and products would make a great blog post on your website. Please let me know of your interest email me at annah@syncfusion.com. We are looking for blogging partners to get the word out about our great .net development products. </p> <div style="clear:both;"></div><img src="http://blogs.msdn.com/aggbug.aspx?PostID=10387644" width="1" height="1">http://blogs.msdn.com/b/pakistan/archive/2013/01/20/immutable-collection-addition-in-net-4-5.aspx#10386755Mon, 21 Jan 2013 07:58:53 GMT91d46819-8472-40ad-a661-2c78acb4018c:10386755Home Addition<p>Very Great Idea, Hope every thing goes success and thank you for giving good post </p> <div style="clear:both;"></div><img src="http://blogs.msdn.com/aggbug.aspx?PostID=10386755" width="1" height="1">