INTRODUCTION TO C# AND HELLO WORLD MY FIRST PROGRAM

C# is general purpose,Object Oriented Programming Language Developed by Microsoft.

The following reasons make C# a widely used professional language:

• Modern, general-purpose programming language.
• Object oriented.
• Component oriented.
• Easy to learn.
• Structured language.
• It produces efficient programs.
• It can be compiled on a variety of  computer platform
• Part of .Net Framework

Strong Programming Features of C#

Although C# constructs closely follow traditional high-level languages C and C++ and being an object-oriented programming language, it has strong resemblance with Java, it has numerous strong programming features that make it endearing to multitude of programmers worldwide.

Following is the list of few important features:

• Boolean Conditions
• Automatic Garbage Collection
• Standard Library
• Assembly Versioning
• Properties and Events
• Delegates and Event Management
• Easy-to-use Generics
• Indexers
• Conditional Compilation
• Simple Multithreading
• LINQ and Lambda Expressions
• Integration with Windows

Hello World First Program

using System;

namespace Project1

{

    class Class1

    {

        static void Main(String[] args){

         /* my first program in C# */

        Console.WriteLine("Hello World");

        } 

    }

}

Output

Hello World

• The first line of the program using System; - the using keyword is used to include the Systemnamespace in the program. A program generally has multiple using statements.
• The next line has the namespace declaration. A namespace is a collection of classes. TheHelloWorldApplication namespace contains the class HelloWorld.
• The next line has a class declaration, the class HelloWorld contains the data and method definitions that your program uses. Classes generally would contain more than one method. Methods define the behavior of the class. However, the HelloWorld class has only one methodMain.
• The next line defines the Main method, which is the entry point for all C# programs. The Mainmethod states what the class will do when executed.
• The next line /*...*/ will be ignored by the compiler and it has been put to add additionalcomments in the program.
• 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.
• The last line Console.ReadKey(); is for the VS.Net Users. This 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.

It's worth to note the following points:

• C# is case sensitive.
• All statements and expression must end with a semicolon (;).
• The program execution starts at the Main method.
• Unlike Java, file name could be different from the class name.