C# is a modern, general-purpose, object-oriented programming language developed by Microsoft and approved by Ecma and ISO.

C# was developed by Anders Hejlsberg and his team during the development of the .Net framework.

C# is designed for the Common Language Infrastructure (CLI). The CLI consists of executable code and a runtime environment that allows the use of a variety of high-level languages ??on different computer platforms and architectures.

C# basic syntax syntax

C# is an object-oriented programming language. In the object-oriented programming method, a program consists of various objects that interact with each other. Objects of the same kind usually have the same type, or are in the same class.

C# basic syntax example

using?System;
namespace?RectangleApplication{
????class?Rectangle
????{
????????//?成員變量
????????double?length;
????????double?width;
????????public?void?Acceptdetails()
????????{
????????????length?=?4.5;????
????????????width?=?3.5;
????????}
????????public?double?GetArea()
????????{
????????????return?length?*?width;
????????}
????????public?void?Display()
????????{
????????????Console.WriteLine("Length:?{0}",?length);
????????????Console.WriteLine("Width:?{0}",?width);
????????????Console.WriteLine("Area:?{0}",?GetArea());
????????}
????}
????
????class?ExecuteRectangle
????{
????????static?void?Main(string[]?args)
????????{
????????????Rectangle?r?=?new?Rectangle();
????????????r.Acceptdetails();
????????????r.Display();
????????????Console.ReadLine();
????????}
????}}