default:
                        // NOTENOTE : we can remove this rule if we enforce the enforced quote
                        // character rule.
                        // That is, if we ask everyone to use single quote or double quote to insert characters,
                        // then we can remove this default block.
                        result.Append(ch);
                        tokenLen = 1;
                        break;

default:
                        throw new FormatException(Environment.GetResourceString("Format_InvalidString"));

default:
                        result.Append(ch);
                        tokenLen = 1;
                        break;