using System;

public class Program

{

    public delegate dynamic f(int i, int j);

    public static void Main()

    {

        var i=0;

        i=function(5,5);

        Console.WriteLine(i);

​

        f f1=function;

        i=f1(2,2);

        Console.WriteLine(i);

        f f2=(j,k) => j+k;

        i=f2(4,3);

        Console.WriteLine(i);

        Console.WriteLine(AddNumbers(1,2,3,4,5));

    }

    public static dynamic function(int i, int j){

      return i+j;   

    }

    static int AddNumbers(params int[] array){

        int res=0;

        foreach(int i in array){

            res+=i;

        }

        return res;

    }

}

​

​