int btnNums = 9;
System.Random r = new System.Random();
int[] array = new int[9];
int a, b;
b = r.Next(9);
array[0] = b;
for (int i = 1; i < btnNums; i++)
{
while (true)
{
a = r.Next(9);
for (int k = 0; k < i; k++)
{
if (a == array[k]) break;
array[i] = a;
}
if (array[i] == a) break;
}Console.WriteLine(array[i]);
}
Console.Read();