C # Languange(pronounced C sharp) is an object-oriented programming language developed by Microsoft as part of an initiative framework. NET Framework. This is based programming language C + + which has been influenced by aspects or features of the language contained in other programming languages such as Java, Delphi, Visual Basic, etc.) with some simplifications. According to standard ECMA-334 C # Language Specification, a C # consists of a Latin letter C (U +0043) followed by a hash mark that indicates the number # (U +0023). # Hash mark that is used is not a sign of sharps in music (U +266 F), and a hash mark # (U +0023) is used because the character of sharps in music not found on the standard keyboard.