Sorting collection of Integers using Quick Sort Algorithm

Here is the code:

class Program
    {
        //   This Solution is written by me and is not completely tested. Please comment if you found any alternative solutions or any enhancement to my solution.
        static void Main(string[] args)
        {
            int[] a1 = new int[] { 5, 3, 5, 2, 1, 0, 8, 10, 9, 20, 32 };