using System;

​

public class Program

{

    public static void Main()

    {

        // Here the Add and Multiply methods/functions are being passed to the Run method,

        // because the Run method accepts a delegate as its first argument. And, because

        // the Add and Multiply methods have the same signature as the delegate, they can

        // be passed to and executed by the Run method.

        Console.WriteLine(Run(Add, 5, 5));

        Console.WriteLine(Run(Multiply, 5, 5));

    }

​

    public delegate double MyFunc(double f1, double f2);

​

    public static double Run(MyFunc SomeFuncWithSameSignatureAsDelegate, double r1, double r2)

    {

        return SomeFuncWithSameSignatureAsDelegate(r1, r2);

    }

​

    // Add and Multiply have the same method signature as the delegate. That is, both

    // functions accept two doubles as arguments.

    public static double Add(double a1, double a2)

    {

        return a1 + a2;

    }

​

    public static double Multiply(double m1, double m2)

    {

        return m1 * m2;

    }

}

​