Flattens an array of arbitrarily nested arrays

FlattenArray

using System;
using System.Collections.Generic;
					
public class Program
{
	public static void Main()
	{
		var array = new Object[]
		{
			new Object[] 
			{
				1, 
			 	2, 
				new Object[] 
				{
					3
				}
			},			
			new Object[] 
			{
				4, 
				5
			},
			new Object[] 
			{
				new Object[] 
				{
					6, 
					new Object[] 
					{
						7, 
						8
					}
				}, 
				9
			}
		};
		
		var result = new List<int>();	
		FlattenArray(array, result);
		
		//print the result as an array
		PrintArray(result.ToArray());
	}
	
	//Takes an arbitrarily nested array and flattens it, adding the items to the list passed to it
	//Using an array would be too costly here since when we add values to the array we would have to resize the array
		//which would initialize a new array
	private static void FlattenArray(Object[] array, List<int> result)
	{
		if(array == null || result == null)
			throw new ArgumentException("Parameters must not be null");
		
		for(int i = 0; i < array.Length; i++)
		{
			//if the current element is an int, add it to the result
			//else recursively call this function on the element since it is an array
			if(array[i] is int)
			{
				result.Add((int)array[i]);
			}
			else
			{
				FlattenArray((Object[])array[i], result);
			}
		}
	}
	
	//Prints an array to the console
	private static void PrintArray(int[] array)
	{
		foreach(int i in array)
			Console.WriteLine(i);
	}
}