internal static bool IsInvalid(char c, bool firstOnlyLetter)
        {
            if (c == ':')             // Special case. allowed in EncodeName, but encoded in EncodeLocalName
            {
                return(false);
            }

            if (firstOnlyLetter)
            {
                return(!XmlChar.IsFirstNameChar(c));
            }
            else
            {
                return(!XmlChar.IsNameChar(c));
            }
        }
 public static bool IsStartNCNameChar(char ch)
 {
     return(XmlChar.IsFirstNameChar(ch));
 }