C# (pronounced C sharp) is a general-purpose, multi-paradigm programming language encompassing strong typing, lexically scoped, imperative, declarative, functional, generic, object-oriented (class-based), and component-oriented programming disciplines. It was developed around 2000 by Microsoft within its .NET initiative and later approved as a standard by Ecma (ECMA-334) and ISO (ISO/IEC 23270:2018). C# is one of the programming languages designed for the Common Language Infrastructure.

Features:
- Compile and run your program
- View program output or detailed error
- Advanced source code editor with syntax highlighting, bracket completion and line numbers
- Open, save, import and share C# files.
- Customize the editor

Limitations:
- Internet connection is required for compilation
- Maximum program running time is 20s
- Only one file at a time
- Some file system, network and graphics functions may be limited
- This is a batch compiler; interactive programs are not supported. For example, if your program provides an input prompt, enter the input in the Input tab prior to compilation.