asp.net不重複的隨機數

 protected void Page_Load(object sender, EventArgs e)
    {
        Set_Random();
    }
    /// <summary>
    /// 產生不重複隨機數的方法
    /// </summary>
    /// <param name="minValue">最小值</param>
    /// <param name="maxValue">最大值</param>
    /// <param name="count">共產生多少隨機數</param>
    /// <returns>int[]數組</returns>
    public int[] GetRandomUnrepeatArray(int minValue, int maxValue, int count)
    {
            Random rnd = new Random();
            int length = maxValue - minValue + 1;
            byte[] keys = new byte[length];
            rnd.NextBytes(keys);
            int[] items = new int[length];
            for (int i = 0; i < length; i++)
            {
                items[i] = i + minValue;
            }
            Array.Sort(keys, items);
            int[] result = new int[count];
            Array.Copy(items, result, count);
            return result;
     }
    public void Set_Random()
    {
        //調用產生隨機數的方法產生的資料數是1111111到9999999之間的隨機數輸出10個
        int[] items = this.GetRandomUnrepeatArray(1111111, 9999999, 10);
        for (int i = 0; i < items.Length; i++)
        {
            Response.Write("產生的隨機數是:" + items[i] + "<br/>");
        }
    }