C# (/si: ʃɑːrp/) is a multi-paradigm programming language encompassing strong typing, imperative, declarative, functional, generic, object-oriented (class-based), and component-oriented programming disciplines.
C major (or the key of C) is a major scale based on sharp, consisting of the pitches C, sharp, sharp, sharp, sharp, sharp, and sharp.
C minor is a minor scale based on sharp, with the pitches C, sharp, E, sharp, sharp, A, and B. Its key signature consists of four sharps.
C (C-sharp) is a musical note lying a chromatic semitone above C and a diatonic semitone below D. C-sharp is thus enharmonic to flat.
C#Builder, from Borland Software Corporation, is a computer program that allows programmers to create Microsoft Windows and Web applications for the Microsoft.NET Framework using the programming language C#.