using System;

public class Program

{

    public static void FTest()

    {

    }

    public static void FunctionOne(int SerialNumber)

    {

        Console.WriteLine("FunctionOne {0}", SerialNumber); 

    }

    public static void FunctionTwo(int SerialNumber)

    {

        Console.WriteLine("FunctionTwo {0}", SerialNumber); 

    }

    public static void FunctionThree(int SerialNumber)

    {

        Console.WriteLine("FunctionThree {0}", SerialNumber); 

    }

    delegate void MyOutput(int i);

    public static void TestDelegate()

    {

        MyOutput mot = new MyOutput(FunctionOne);

        mot += new MyOutput(FunctionTwo);

        mot += new MyOutput(FunctionThree);

        mot(1);

        mot(2);

        mot(3);

    }

    public static void TestDelegateAction()

    {

        Action<int> funx = FunctionOne;    // ms: Action<T> delegate instead of explicitly defining a new delegate and assigning a named method to it.

        // https://www.dotnetperls.com/action

        // Action. This is a function object. Action objects return no values. The Action type is similar to a void method. This generic type is found in the System namespace.

        // To specify an Action, we must have no return value. The Action must never return a value onto the evaluation stack. Often we use lambdas to specify Actions.

        funx += FunctionTwo;

        funx += FunctionThree;

        funx(1);

        funx(2);

        funx(3);

    }

    public static void Main()

    {

        Console.WriteLine("start {0}", DateTime.Now.ToString("yyyy-MM-dd hh:mm:ss"));

        // TestDelegate();   // in fiddle the order of calling is the same as adding delegates in TestDelegate fun

         TestDelegateAction();

    }

}