in which language .net framework has been written?

Question

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What language is .NET Framework written in?

in which language .net framework has been written?

Answer 1

The majority of the BCL is is written in C#. It does rely on many native Win32 APIs via PInvoke.

The actual CLR is written in C++

Answer 2

The .NET framework consists of many components: the language compilers, the BCL, the CLR, ... Some are written in unmanaged C++, other parts in managed .NET.