How can you get the first digit in an int (C#)?

Question

In C#, what\'s the best way to get the 1st digit in an int? The method I came up with is to turn the int into a string, find the 1st char of the string, then turn it back to

Answer 1

An obvious, but slow, mathematical approach is:

int firstDigit = (int)(i / Math.Pow(10, (int)Math.Log10(i))));