Calculate the number of 9 digits in a group, and the number of the first n digits can be divisible by N. For example, the first two digits can be divisible by 2, the first three digits can be divisible by 3... The first nine digits can be divisible by 9.

Code
Stopwatch Rochelle cc_stopwatch = new stopwatch ();
Rochelle cc_stopwatch.start ();

Random rad = new random ();
While (true)
{
String Ts = string. empty;
While (TS. Length <9)
{
String TMP = rad. Next (1, 10). tostring ();
If (TS. indexof (TMP) <0)
{
TS + = TMP; // obtain the number of unique digits.
}
}
Bool flag = false;
For (INT m = 2; m <= 9; m ++)
{
If (int32.parse (TS. substring (0, m) % m = 0) // The first n digits can be divisible by N
{
Flag = true;
}
Else
{
Flag = false;
}

If (flag = false)
{
Break;
}
}

If (FLAG)
{
Console. writeline (TS );
Break;
}
}

Rochelle cc_stopwatch.stop ();
Console. writeline ("{0}: Seconds", l_cc_stopwatch.elapsed.totalseconds );