双色球生成器

protected void Button2_Click(object sender, EventArgs e)
    {
         Random blueRandom=new Random();
            Label2.Text = "<span style='color: red'>" + RandSetNubString(6) + "</span>" + "：<span style='color: blue'>" + blueRandom.Next(1, 17).ToString() + "</span>";
         }

    string RandSetNubString(int N)
    {
        string strchar = "0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33";

        string[] sslist = strchar.Split(',');

        string str = "";

        int temp = -1;

        Random random = new Random();

        int[] selected=new int[N];

        for (int i = 1; i <N+1; i++)
        {
            if (temp != -1)
            {
                random = new Random(i * temp * unchecked((int)DateTime.Now.Ticks));
            }

            int x = random.Next(1,34);

            bool isselect = false;

            if (selected.Length > 0)
            {
                for (int j = 0; j < selected.Length; j++)
                {
                    if (selected[j] == x)
                    {
                        isselect = true;
                    }
                }
            }
            if (temp != -1 && temp == x || isselect==true)
            {
                return RandSetNubString(N);
            }
            temp = x;

            selected.SetValue(x, selected.Length - 1);

            str += sslist[x]+" ";
        }
        return str;    

    }