This is the first tutorial as part of the Visual Basic .NET 2005 Training. In this tutorials we will be learning about the basics of The .NET Framework Architecture, The .NET vision, Common Language Runtime (CLR), .NET Framework Class Library and Microsoft Intermediate Language (MSIL). It's very important to learn the basics before we actually start with the Programming.

The .NET Vision

The .NET framework is a software technology that is directed towards connecting information, people, systems and devices seamlessly. The high level of software integration that has been attempted through use of XML web services enables the creation of small, discrete, building block types of applications. These applications are connected to other applications over the Internet.

Central to the .NET framework architecture is the effort to provide support to for the next generation solutions. The direction of change is to ensure that software deployment and versioning conflicts are avoided or minimized in the .NET Framework. User defined codes are released from the confines of the local storage systems and can be stored anywhere on a network and executed from any point in the network. Performance problems associated with scripted and interpreted environments are removed. Codes can be safely executed and the developer experience is consistent across widely varying types of applications, such as Windows based applications and web based applications. The thrust of design is towards creating a standard communication facility that is standardized so that .NET codes can be integrated with other codes easily and seamlessly.

At the core of the .NET infrastructure is the Common Language Runtime (CLR) and the .NET Framework class library.

The runtime functions, like an agent, managing code at execution time. It provides core services such as memory management, thread management and ‘remoting’. It enforces strict type safety and ensures code accuracy. This makes for security and robustness and provides a platform for running managed code.

The .NET Framework provides several runtime hosts. It also supports the development of third-party runtime hosts. For example, ASP.NET hosts the runtime to provide a scalable, server-side environment for managed code. ASP.NET works directly with the runtime to enable ASP.NET applications and XML Web services.

The .NET Framework can be hosted by unmanaged components such as the Internet Explorer. These load the common language runtime into their processes and initiate the execution of managed code. This creates a software environment that can exploit both managed and unmanaged features. This makes for mobility of the code.

Common Language Runtime (CLR)

The common language runtime (CLR) is the foundation upon which developers construct various kinds of applications. The benefits of the CLR are many. It makes for a vastly simplified development. It enables a seamless integration of code written in different languages. It provides evidence-based security with code identity. The assembly based deployment eliminates the problems of DLL. The versioning of reusable components makes for ease of usage. The implementation inheritance feature enables the reuse of code. The automatic object lifetime management makes the application- development comfortable. The self descriptive nature of objects makes for ease of programming and debugging.

CLR includes both private and shared components. It provides for incremental download of code and caching; native platform interoperability and seamless integration with COM. It offers dynamic inspection capabilities, administration and configuration options. The developer is not required to know all the runtime supported infrastructure. The tools and frameworks are designed to expose a subset of the functionality in accordance with the kind of application being built.

The common language runtime is a virtual execution system that provides important services such as memory management, security and also has a Just-in-Time compiler (JIT) which converts the intermediate language (IL) into native code that can be executed by the physical machine. The infrastructure provides a machine independent environment for application execution.

Next Page: .NET Framework Class Library