C# Parallel Interview Question

Program.cs

class Program
{
    static void Main(string[] args)
    {
        Random rand = new Random();
        var currentInt = 0;

        int[] tasks = new int[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 }; // Should have used F#.

        Parallel.ForEach(tasks, (x) =>
        {
            currentInt = x;
            Thread.Sleep(rand.Next(1000, 5000));
            Console.WriteLine(string.Format("{0} is done processing.", currentInt));
        });
    }
}