What is Visual Basic .NET written in?

Year 2002 Paradigm object-oriented, imperative Typing static
The Visual Basic .NET compiler is written in C# (documented).

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Compiler Implementation

LanguageConfidenceNotesSource
C# 90% Roslyn handles both C# and VB.NET Source

Frequently Asked Questions

What language is Visual Basic .NET written in?
Visual Basic .NET is primarily implemented in C#. See the implementation section above for details and source references.

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