http://ecn.channel9.msdn.com/o9/previewImages/100/542452_100x75.jpg ISV Architect Evangelist Bruce Kyle of Microsoft and MVP Stuart Celarier explore the new languages features in C#. It's a Whirlwind Tour of the important language features of C# 4. Stuart describes each major feature and why it is useful. But doesn't get into best practices nor suggested usages. Just the facts about each feature. Whirlwinds are bite-sized webcasts, generally shorter than 15 minutes. You can start anywhere in the series to learn about the parts you're most interested in.This session on dynamic lookup introduces a new pseudo-type dynamic is introduced into the C# type system. It's used to call dynamic languages, COM object, or XML using types not known at compile time (aka duck typing). Stuart introduces the concepts of dynamic lookup and how you use it in your C# code.For more information about how to create a dyanamic lookup language for XML, see deCast - Dynamic Xml with C# 4.0.Also see dynamic languages IronPython and IronRuby. Discover the entire series on C#. What's new in C# 2 Whirlwind 1 - Generics Whirlwind 2 - Iterators Whirlwind 3 - Partial types, Anonymous methods Whirlwind 4 - Accessors, Static Classes, Nullable Types What's new in C# 3 Whirlwind 5 - Automatically Implemented Properties, Type Inference, Initializer Whirlwind 6 - Anonymous types, Extension method  Whirlwind 7 - Lambda Expressions Whirlwind 8 - Linq What's new in C# 4 Whirlwind 9 - Introducing C# 4  Whirlwind 10 - Dynamic Lookup  Whirlwind 11 - Named & Optional Parameters  Whirlwind 12 - More COM Love  Whirlwind 13 - Covariance & Contravariance  Whirlwind 14 - Events For the latest news for developers and ISVs, see US ISV Developer Community blog.Download code samples from VisualStuart.net. Also check out Stuart's blog posts C# 4 on Visual Stuart.NET. To run the examples, Stuart used IronPython 2.6.1 RC for .NET 4 RC. But you should be able to use later versions of IronPython. en Tue, 21 May 2013 20:34:22 GMT Tue, 21 May 2013 20:34:22 GMT Rev9