IsPalindrome

public static bool IsPalindrome(string number)
    {
        int min = 0;
        int max = number.Length - 1;
        while (true)
        {
            if (min > max)
            {
                return true;
            }
            char a = number[min];
            char b = number[max];
            if (char.ToLower(a) != char.ToLower(b))
            {
                return false;
            }
            min++;
            max--;
        }
    }