using System;

using System.Windows.Forms;

delegate void DisplayMessage(string message);

public class TestCustomDelegate

{

   public static void Main()

   {

      DisplayMessage messageTarget; 

      if (Environment.GetCommandLineArgs().Length > )

         messageTarget = ShowWindowsMessage;

      else

         messageTarget = Console.WriteLine;

      messageTarget("Hello, World!");

   }      

   private static void ShowWindowsMessage(string message)

   {

      MessageBox.Show(message);

   }

}

using System;

using System.Windows.Forms;

public class TestAction1

{

   public static void Main()

   {

      Action<string> messageTarget; 

      if (Environment.GetCommandLineArgs().Length > )

         messageTarget = ShowWindowsMessage;

      else

         messageTarget = Console.WriteLine;

      messageTarget("Hello, World!");

   }      

   private static void ShowWindowsMessage(string message)

   {

      MessageBox.Show(message);

   }

}

using System;

using System.Windows.Forms;

public class TestAnonMethod

{

   public static void Main()

   {

      Action<string> messageTarget; 

      if (Environment.GetCommandLineArgs().Length > )

         messageTarget = delegate(string s) { ShowWindowsMessage(s); };

      else

         messageTarget = delegate(string s) { Console.WriteLine(s); };

      messageTarget("Hello, World!");

   }

   private static void ShowWindowsMessage(string message)

   {

      MessageBox.Show(message);

   }

}

using System;

using System.Windows.Forms;

public class TestLambdaExpression

{

   public static void Main()

   {

      Action<string> messageTarget; 

      if (Environment.GetCommandLineArgs().Length > )

         messageTarget = s => ShowWindowsMessage(s);

      else

         messageTarget = s => Console.WriteLine(s);

      messageTarget("Hello, World!");

   }

   private static void ShowWindowsMessage(string message)

   {

      MessageBox.Show(message);

   }

}

using System;

using System.Collections.Generic;

class Program

{

    static void Main()

    {

        List<String> names = new List<String>();

        names.Add("Bruce");

        names.Add("Alfred");

        names.Add("Tim");

        names.Add("Richard");

        // Display the contents of the list using the Print method.

        names.ForEach(Print);

        // The following demonstrates the anonymous method feature of C#

        // to display the contents of the list to the console.

        names.ForEach(delegate(String name)

        {

            Console.WriteLine(name);

        });

    }

    private static void Print(string s)

    {

        Console.WriteLine(s);

    }

}

/* This code will produce output similar to the following:

 * Bruce

 * Alfred

 * Tim

 * Richard

 * Bruce

 * Alfred

 * Tim

 * Richard

 */