static void Main(string[] args)
    {
        const int SIZE = 50;
        int[] array = new int[SIZE];
        int index = 0;
        int aScore = 0;

        do
        {
            Console.WriteLine("Enter a value for the array for position {0} (or 0 to stop):", (index + 1));
            aScore = int.Parse(Console.ReadLine());
            if(aScore >= 0)
            {
                array[index++] = aScore;
            }
        }while (aScore != 0 && index < SIZE);


        Console.WriteLine("The product of the array is: {0}", SumArray(array));
        Console.ReadLine();
    }

    static int SumArray(int[] array)
    {
        int product = 1;
        for (int i = 0; i < array.Length; i++)
        {
            product *= array[i];
        }
        return product;
    }