WriteAttributeString method 
    
      
void
WriteAttributeString(
 - String localName, 
- String? stringValue
) 
    
  
Writes the attribute value.
The local name of the attribute.
The String value.
    
  Implementation
  void WriteAttributeString(String localName, String? stringValue) {
  try {
    this._xmlWriter!.WriteAttributeStringJust(localName, stringValue);
  } on ArgumentException catch (ex, stacktrace) {
    // XmlTextWriter will throw ArgumentException if String includes invalid characters.
    throw new ServiceXmlSerializationException(
        "InvalidAttributeValue($stringValue, $localName)", ex, stacktrace);
  }
}