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.Net Framework


.NET Framework is a managed execution environment for Windows that allows software developers to create an app in one programming language and be assured that the app will be able to work with code written in other languages. The framework is designed to accommodate object code no matter where it is stored or executed.

The .NET Framework is the predominant implementation of Microsoft's .NET technologies. The framework features a common language runtime (CLR) and a class library. The CLR is Microsoft's implementation of the common language infrastructure (CLI), a standard for helping different programming languages and libraries work together. The CLR manages system services such as memory, thread execution, code execution, code safety verification and compilation. The class library contains tested, reusable code that developers can call from their own apps to provide functionality for such things as file input/output, parsing XML and working with Windows Forms. 

Microsoft's development tool for designing and developing .NET apps is called Visual Studio and apps are typically written in Visual Basic (VB), C# or F#. The Microsoft Test Framework (MSTest) can be used to provide quality assurance (QA) for .NET applications.

How the .NET Framework works

Source code written in one language is compiled into an intermediate language (IL) which is stored on disk in an executable file called an assembly. The assembly contains a manifest that provides information about the code's type, version and security requirements. Once the assembly is loaded into the CLR and validated, the IL code can be translated into native machine instructions. 

Language compilers for the .NET Framework use the Common Intermediate Language (CIL), an intermediate code that is compiled at runtime by the common language runtime. The .NET Framework helps resolve version conflicts because it allows multiple versions of the CLR to exist on the same computer.

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