C# (Eng-gí tha̍k "C sharp") sī chi̍t khoán thêng-sek gí-giân, ū kiông lūi-hêng (strong typing), bēng-lēng-sèng (imperative), soan-kò-sèng (declarative), thong-iōng-sèng (generic), koan-sò͘-sèng (functional), bu̍t-kiāⁿ tō-hiòng (object-oriented) téng te̍k-sek.

Khai-hoat-chiá sī Microsoft kong-si, sī in .NET hāng-bo̍k chi it, āu-lâi piàn Ecma kiam ISO piau-chún.