Excel Sheet Column Number

Related to question Excel Sheet Column Title

Given a column title as appear in an Excel sheet, return its corresponding column number.

For example:

    A -> 1
    B -> 2
    C -> 3
    ...
    Z -> 26
    AA -> 27
    AB -> 28 

static public int TitleToNumber(string s) {
	int number = 0;
	int deliver = 1;
	char[] chars = s.ToCharArray();
	int length = chars.Length;
	for (int i = length-1; i>=0; i--) {
		number += (chars[i] - 65 + 1) * deliver;
		deliver *=  26;
	}
	return number;
}