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C# 4.0 is the latest version of the C# programming language, which was released in April 12, 2010. Microsoft has released the 4.0 runtime and development environment Visual Studio 2010. The major focus of C# 4.0 is interoperability with partially or fully dynamically typed languages and frameworks, such as the Dynamic Language Runtime and COM.
This video offers a historical perspective about where C# comes from and the trends that shaped the thinking for C# 3.0 and C# 4.0. These trends include declarative programming, dynamic & functional languages and concurrent programming. The theme of C# 4.0 is dynamic programming and following are discussed: -Dynamically typed objects -Optional and named parameters -Improved COM interoperability -Co- and contra-variance