How to format int into a string with leading Zeros and Commas

Question

I need to convert an int to a string that is always 9 digits + 2 commas in length.

1 would become 000,000,001

12345 would become 000,012,345

and so on

I know I can use ToString().PadLeft(...) to add the leading zeros but don't know how to add the commas without using a few if tests. Is there a more efficient way to do this?

Answer 1

Just using:

int myint = 12345;
string formatted = myint.ToString("000,000,000");