public
static
bool
IsValidCodeMelli(
this
string
codeMelli)
{
Int64 number;
int
sum = 0, temp;
Int64.TryParse(codeMelli,
out
number);
if
(Math.Log10(number) > 6 && Math.Log10(number) < 10)
{
temp = Convert.ToInt16(number % 10);
number /= 10;
for
(
int
i = 2; i < 11; i++)
{
sum += Convert.ToInt16(i * (number % 10));
number /= 10;
}
if
(((sum % 11 < 2) && (sum % 11 == temp)) ||
((sum % 11 >= 2) && ((11 - sum % 11) == temp)))
return
true
;
}
return
false
;
مثال: