using System;

public class Program

{

    public static void Main()

    {

        var a1 = 1;

        var a2 = 2;

        var a3 = 3; 

        with_params(a1,a2,a3);

        no_params(new [] {a1,a2,a3});

    }

​

    public static void with_params(params int[] x) {}

    public static void no_params(int[] x) {}

}