using System;

​

public class Program

{

    public static void Main()

    {

        int result = 0;

        // positional

        result = Add(1, 2, 3);

        Console.WriteLine(result);

        // named

        result = Add(first: 1, second: 2, third: 3);

        Console.WriteLine(result);

        // named, out of order

        result = Add(third: 3, second: 2, first: 1);

        Console.WriteLine(result);

        // named, out of order, but invalid

        // ERROR: CS8323 Named argument is used out-of-position but is followed by an unnamed argument

        // result = Add(third: 3, 2, 1);

    }

​

    static int Add(int first, int second, int third)

    {

        return first + second + third;

    }

}