A beginner's guide to C# and .NET. It explains what C# is, what .NET provides (the SDK, the CLR and ASP.NET Core), and how a C# program runs: the compiler turns source code into IL, and the CLR's JIT compiler turns IL into native machine code, with garbage collection and exception handling built in. It ends by installing the .NET SDK and building a first C# application with the dotnet CLI.
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