public int GetLength(string str)    {        if (str.Length == 0) return 0;        ASCIIEncoding ascii = new ASCIIEncoding();        int tempLen = 0;        byte[] s = ascii.GetBytes(str);        for (int i = 0; i < s.Length; i++)        {            if ((int)s[i] == 63) tempLen += 2;            else tempLen += 1;        }        return tempLen;    }