using System;
class SayHello {
    public static int Main(string[] args) {
        if (args.Length > 0) {
            foreach (string arg in args) {
                if (arg.Equals("/help")) {
                    Console.WriteLine("Run this program as follows:" +
                              "sayhello.exe [name1] ");
                    return (1);
                } else
                    Console.WriteLine("Hello " + "{0}", arg);
            }
            return (0);
        } else
            Console.WriteLine("For help, run sayhello.exe /help");
        return (2);
    }
}

    

using System;

public class InitArray
{
public static void Main( string[] args )
{
int arrayLength = Convert.ToInt32( args[ 0 ] );
int[] array = new int[ arrayLength ]; // create array

int initialValue = Convert.ToInt32( args[ 1 ] );
int increment = Convert.ToInt32( args[ 2 ] );

for ( int counter = 0; counter < array.Length; counter++ ) array[ counter ] = initialValue + increment * counter; Console.WriteLine( "{0}{1,8}", "Index", "Value" ); for ( int counter = 0; counter < array.Length; counter++ ) Console.WriteLine( "{0,5}{1,8}", counter, array[ counter ] ); } } [/csharp]

   


using System;

public class TheMainFunction
{
    public static void Main()
    {
        Console.WriteLine("Hello, Universe!");
    }
}

           
          

   



using System;

public class ReturninganIntStatus
{
    public static int Main()
    {
        Console.WriteLine("Hello, Universe!");
        return(0);
    }
}

           
          

   



using System;

public class CommandLineParameters
{
    public static void Main(string[] args)
    {
        foreach (string arg in args)
        Console.WriteLine("Arg: {0}", arg);
    }
}
           
          

   



// error 
using System;
class Complex
{
    static int Main()
    {
        // test code here
        Console.WriteLine("Console: Passed");
        return(0);
    }
}

public class TheMainFunctionMultipleMains
{
    public static void Main(string[] args)
    {
        foreach (string arg in args)
        Console.WriteLine(arg);
    }
}
           
          

   

/*
Learning C# 
by Jesse Liberty

Publisher: O'Reilly 
ISBN: 0596003765
*/
 namespace NotePad
 {
    public class HelloWorld
    {
       // every console app starts with Main
       static void Main()
       {
          System.Console.WriteLine("Hello world!");
       }
    }
 }