Beginning C# programming with Hello World

The following is a simple “Hello World” program in C# programming −

Example

Live Demo

using System; namespace MyHelloWorldApplication {    class MyDemoClass {       static void Main(string[] args) {          // display text          Console.WriteLine("Hello World");          // display another text          Console.WriteLine("Welcome!");          Console.ReadKey();       }    } }

Output

Hello World Welcome!

Let us see now what all it includes −

• using System − the using keyword is used to include the System namespace in the program.
• namespace declaration − A namespace is a collection of classes. The MyHelloWorldApplication namespace contains the class HelloWorld.
• The class MyDemoClass contains the data and method definitions that your program uses. Classes generally contain multiple methods.
• The Main method is the entry point for all C# programs. The Main method states what the class does when executed.
• The Main method specifies its behavior with the statement Console.WriteLine("Hello World");
• WriteLine is a method of the Console class defined in the System namespace. This statement causes the message "Hello, World!" to be displayed on the screen. Add more text using the same Console.WriteLine(); in C#.
• Console.ReadKey(); It makes the program wait for a key press and it prevents the screen from running and closing quickly when the program is launched from Visual Studio .NET.