Creating Methods with a Variable Number of Arguments

Here's an example of a method which calculates the sum of a variable number of integers:

using System;

public class Test 
{
    public static int GetSum(params int[] numbers) 
    {
        int sum=0;
        foreach(int num in numbers)
            sum+=num;
        return sum;
    }

    public static void Main(string[] args) 
    {
        Console.WriteLine(GetSum(1,2,3,4,5,6,7,8,9));
        Console.WriteLine(GetSum(2,4,6,8));
    }
}