This three-day course covers the essentials of the .NET Framework for programmers who already know the Visual Basic language and the fundamentals of Windows Forms. It pairs with the course Visual Basic Essentials to form a five-day introduction to Visual Basic and the .NET Framework for experienced programmers. The course starts with an introduction to the architecture and key concepts of .NET. It then discusses class libraries, assemblies, versioning, configuration, and deployment, which constitute a major advance in the simplicity and robustness of deploying Windows applications, ending the notorious DLL hell. The next two chapters discuss important topics in the .NET programming model, including metadata, reflection, I/O, and serialization. The following chapter continues the discussion of the .NET programming model, covering memory management, threading, asynchronous programming, application domains, marshal by value, marshal by reference, and.NET remoting.