C# 排序问题

int[] zn = new int[] {5,-3,4,8,-1};
            for (int a = 5; a > 0; a--)
            {
                for (int b = 5; b > 0; b--)
                {
                    if (zn[b] < zn[b - 1])
                    {
                        int c = zn[b];
                        zn[b] = zn[b - 1];
                        zn[b - 1] = c;
                    }
                }
            }
             foreach(int t in zn)
             {
                Console.WriteLine(t);
             }