using System;

​

public class Program

{

    public static void Main() // Main is the entry point of any program, every program must have it

    {

        new Program().Run();

    }

    public static void Print(object message)

    {

        Console.WriteLine(message); 

    }

​

    // EXAMPLE 1: Delegates

​

    // C# documentation: https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/delegates/

    // A delegate is a type that represents references to methods with a particular parameter list and return type.

    // Explanation: a delegate is a reference to a method that has specific parameter types and return type

    // To use a delegate, you first have to create the delegate, and then create an instance of that delegate

    private delegate int DelegateName(int first, int second); // Create a new Delegate named DelegateName that returns int and has 2 integer typed parameters.

    private DelegateName example = null; // Create an instance of the delegate we just created.

    public void Run()

    {

        int result = 0;

        // example expects a method that returns int and has 2 integer typed parameters

        example = Add;

        // There are 2 ways to invoke (call) a delegate:

        result = example(5, 10); // same as any other method

        Print(result);

        result = example.Invoke(5, 10); // By calling the Invoke function on the delegate

        Print(result);

    }

​

    private int Add(int firstParam, int secondParam) // The names of the parameters do not have to match the delegate parameter names, only the type

    {

        return firstParam + secondParam;

    }

}