Chapter 3. Language and Dynamic Changes

There are some welcome changes to C# and VB.NET, and some major enhancements to the Common Language Runtime (CLR) and Base Class Library (BCL) in .NET 4.0. I have separated these changes into two chapters: this chapter covers language and Chapter 4 covers the CLR and BCL (although there is of course some overlap).

In this chapter, I will be covering the following:

• Future coevolution of VB and C#

• Changes to C# and VB

• Improved COM interoperability

• Variance

• Dynamic code

• F#