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Key features Of Microsoft Visual Studio 2010 and .NET 4.0 Microsoft announced the next version of its developer platform, which will be named Visual Studio 2010 and .NET Framework 4.0.  Microsoft said VS10 will focus on five key areas (in marketing-speak): riding the next-generation platform wave, inspiring developer delight, powering breakthrough departmental applications, enabling emerging trends such as cloud computing, and democratizing application life-cycle management (ALM). “With Visual Studio 2010 and the .NET Framework 4.0, we are focused on the core pillars of developer experience, support for the latest platforms spanning client, server, services and devices, targeted experiences for specific application types, and core architecture improvements,” said S. Somasegar, senior vice president of the Developer Division at Microsoft.  “These pillars are designed specifically to meet the needs of developers, the teams that drive the ap...

C# Features in the .NET Framework 4 Since its initial release in 2002, the C# programming language has been improved to enable programmers to write clearer, more maintainable code. The enhancements have come from the addition of features such as generic types, nullable value types, lambda expressions, iterator methods, partial classes and a long list of other useful language constructs. And, often, the changes were accompanied by giving the Microsoft .NET Framework libraries corresponding support. This trend toward increased usability continues in C# 4.0. The additions make common tasks involving generic types, legacy interop and working with dynamic object models much simpler. This article aims to give a high-level survey of these new features. I’ll begin with generic variance and then look at the legacy and dynamic interop features. Covariance and Contravariance Covariance and contravariance are best introduced with an example, and the best is in the framewor...