File Extension CS

  • Full name
    Microsoft Visual Studio Visual C#.NET Source Format
  • Developer
  • Popularity
Have you encountered a problem with a CS file? Don’t you know which program opens a file with this extension? You will find all the information you need about working with a CS file here. In the further part of this page we have added a list of programs that should open your CS file. It is enough you choose a proper application for your operating system, download and install it.


Files with the extension CS are source code files in the programming language C #, which is pronounced C Sharp and often also written. Cs files can contain the source code for entire programs or even only parts, for example classes or functions, which are referenced in another CS file, dH Includes (so-called includes). In addition, Visual C # .NET files are marked with the extension CS. These files also contain C # code, but also autogenerated Microsoft Visual IDE code, for example for graphical user elements.

C # is a .NET language and compiled C # programs require an installed .NET framework. Meanwhile, there is version 4 of the NET framework, which unfortunately is not 100% downwards compatible. Originally, the .NET introduced by Microsoft was a Windows-specific framework, but now there is also the possibility with Mono .NET programs on and for Linux and Mac OSX to develop.

CS files are just text files that can be processed by a C # compiler. They can be opened and edited in any text editor, however it is recommended to use editors with developer functions such as syntax highlighting or an integrated development environment (IDE) for easier work.

In principle, CS files can be compiled with any C # compiler. H. Convert to an executable program. However, compilation errors may occur depending on the include used (eg certain special libraries, mono). On Windows you need at least the .NET SDK to compile CS files via command line. (Command: csc)

Programs which can open a CS file

How to open a CS file? Advice and guidance

Absolutely most often appearing reason that prevents you from opening the CS file is the lack of a proper application to support it in your operating system. It is notably the first thing you need to address. When one of the programs to support a CS file from the list is already installed, you can try to rerun the file. The system should display a message asking you to choose a primary application to support CS files. At this point we are looking for disk space where the application was installed in and we can link it with a CS file. Since then, our operating system will use the selected program to support all CS files.

Other issues

Despite the described problem with CS there may be many more problems. If the existing operations were not effective, get involved with the following matters:

- verify that the CS file is not damaged and that it has been downloaded or copied in whole
- verify that the file has a file extension that has not been intentionally changed (for example, if it do not contain other information than its extension suggests)
- make sure again whether the CS file type is linked in the operating system with a proper program
- make sure that the file is not infected with a virus and you have up to date software and drivers.

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