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During the development of the .NET Framework, the class libraries were originally written using a managed code compiler system called "Simple Managed C" (SMC). In January 1999, Anders Hejlsberg formed a team to build a new language at the time called Cool, which stood for "C-like Object Oriented Language". Microsoft had considered keeping the name ...

The core syntax of the C# language is similar to that of other C-style languages such as C, C++ and Java, particularly: 1. Semicolons are used to denote the end of a statement. 2. Curly brackets are used to group statements. Statements are commonly grouped into methods (functions), methods into classes, and classes into namespaces. 3. Variables are...

C# has a unified type system. This unified type system is called Common Type System(CTS). A unified type system implies that all types, including primitives such as integers, are subclasses of the System.Object class. For example, every type inherits a ToString()method.

The C# specification details a minimum set of types and class libraries that the compiler expects to have available. In practice, C# is most often used with some implementation of the Common Language Infrastructure (CLI), which is standardized as ECMA-335 Common Language Infrastructure (CLI). In addition to the standard CLI specifications, there ar...

Hello World

The following is a very simple C# program, a version of the classic "Hello world" example: Using C# 9 Top-level statementsfeature the entry point logic of a program can be written without declaring an explicit type or Main method.Until C# 8 remains the classic way: This code will display this text in the console window: Each line has a purpose: The above line imports all types in the System namespace. For example, the Console class used later in the source code is defined in the Systemnamespa...

GUI

A GUIexample: This example is similar to the previous example, except that it generates a dialog boxthat contains the message "Hello, World!" instead of writing it to the console.

Images

Another useful library is the System.Drawinglibrary, which is used to programmatically draw images. For example: This will create an image that is identical to that stored in "Image.png".

In August 2001, Microsoft Corporation, Hewlett-Packard and Intel Corporation co-sponsored the submission of specifications for C# as well as the Common Language Infrastructure (CLI) to the standards organization Ecma International.In December 2001, ECMA released ECMA-334 C# Language Specification. C# became an ISO standard in 2003 (ISO/IEC 23270:20...

Microsoft is leading the development of the open-source reference C# compilers and set of tools. The first compiler, Roslyn, compiles into intermediate language (IL), and the second one, RyuJIT, is a JIT (just-in-time) compiler, which is dynamic and does on-the-fly optimization and compiles the IL into native code for the front-end of the CPU. RyuJ...