C#

C# is a general-purpose, object-oriented, type-safe programming language. Designed for programmer productivity, the C# language is platform-neutral, although written to work well with the Microsoft .NET Framework. C# is a rich implementation of object oriented programming (OOP) language, which includes encapsulation, inheritance, and polymorphism.

Encapsulation: creating a boundary around an object to separate its public behavior from its private implementation details.
Inheritance: enables you to create new classes that reuse, extend, and modify the behavior that is defined in existing classes.
Polymorphism: the characteristic of being able to assign a different meaning or usage to something in different contexts - specifically, to allow a variable to refer to more than one type of object.

C# is primarily used for writing code that runs on Windows platforms. However, it can be used to write cross-platform code in the following scenarios:

C# running on a server can be used to produce HTML that can run on any platform. (ASP.NET)
C# code may run on a runtime other than the Microsoft Common Language Runtime (MCLR). Example: Mono project, with its own C# compiler and runtime ... on Linux, Solaris, Mac OS X, and Windows.
C# code may run on a host supporting Microsoft Silverlight (for Windows and Mac OS X).

C# is case-sensitive.

Compiler downloads:

Mono
Visual C# 2010 Express: You must register to obtain a free product key for ongoing use after 30 days.

The Main method designates the program’s entry point.
Example:

static void Main(string[] args)
{
    code
}

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Please note: Console is a built-in class.
The console class represents the standard input, output, and error streams for console applications. This class cannot be inherited.

static void Main(string[] args)
{
    Console.WriteLine("Wait for it...Hello World!");
}

Almost english, isn't it? We just told the computer we want it to output (write) a line of text saying:
Wait for it...Hello World! >>> Tribute to Barney of How I met your mother.

Welcome to Gtekk.

This section contains a Quick reference of code elements.

This section contains examples of various layouts with step-by-step instruction.