#region 随机洗牌 
int[] ints = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 }; 
List<int> list=ints.ToList(); 
int[] outs = new int[20]; 
Random rand = new Random(); 
for (int i = 0; i < 20; i++) 
{ 
    int x = rand.Next(list.Count); 
    outs[i] = list[x]; 
    list.RemoveAt(x); 
} 
Response.Write("<hr/>"); 
foreach (int i in outs) 
{ 
    Response.Write(i.ToString() + " "); 
} 
#endregion