using static System.Console;

​

public class Exemplo {

    public static void Main() {

        UseParams(1, 2, 3, 4);

        UseParams(1);

        UseParams();

        UseParams(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);

        UseParams2("lista", 1, 2, 3, 4);

    }

    public static void UseParams(params int[] list) {

        foreach (var item in list) Write(item + " ");

        WriteLine();

    }

    public static void UseParams2(string text, params int[] list) {

        Write(text + ": ");

        foreach (var item in list) Write(item + " ");

        WriteLine();

    }

}