C# Tutorial: The first step towards C#

Here is a program in C# which describes its four styles of Main Function
Please feel free discuss on the program.
/*
* Copyright© Microsun®
* Programmed by Prabakar Devarajan
* Programmed On 12/3/2004 @ 9:34 AM
* email : prabakar.microsun@gmail.com
*/

/*
* 4 Styles of Main:

1. public static void Main() { }
2. public static void Main(string[] args) { }
3. public static int Main() { return 0; }
4. public static int Main(string[] args) { return 0; }
*/

using System;

namespace EntryPointInCSharp
{
class MainClass
{
//public static int Main(string[] args)
//public static int Main()
//public static void Main()
public static void Main(string[] args)
{
Console.WriteLine("Hello World!");
}
}
}