I think this one is a good candidate (threats space as an ordinary char). Feel free to use it Wink


public static bool IsPalindrome(string s)
{
    if(null == s)
        return false;

    for(int f=0, b = s.Length - 1; f < b; f++, b--)
    {
        if(s[f] != s[b])
            return false;
    }
    return true;
}

Cheers Martin, with a phone number in palindrome...cool huh?