What is the basic structure of a C# program?

Let us first look at a C# sample program-

using System;

namespace DemoApplication {

   class HelloWorld {

      static void Main(string[] args) {

         Console.WriteLine("Welcome!");
         Console.ReadKey();
      }
   }
}

Now let us see what the above program contains-

using

The first line of the program using System; - The using keyword is used to include the system namespace in the program. A program usually has multiple using statements.

Namespace declaration

The next line is the namespace declaration. A namespace is a collection of classes. The DemoApplication namespace contains the class HelloWorld.

Class Declaration

The next line has a class declaration, class HelloWorld contains the data and method definitions used by your program. Classes usually contain multiple methods. Methods define the behavior of a class. However, the HelloWorld class has only one method Main.

Main method

The next line defines the Main method, which is the entry point program for all C#. The Main method describes what the class does when executed.

Console.WriteLine

The Main method uses the statement Console.WriteLine("Welcome!"); to specify its behavior. >

WriteLine is a method of the Console class defined in the System namespace. This statement causes the message "Welcome!"

Console.ReadKey()

The last line Console.ReadKey(); is for VS.NET users. This causes the program to wait for key presses and prevents the screen from quickly running and closing when launching the program from Visual Studio .NET.

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