https://learn.microsoft.com/en-us/dotnet/api/system.configuration.configurationelement.serializeelement?view=netframework-4.8.1&redirectedfrom=MSDN
ConfigurationElement.SerializeElement(XmlWriter, Boolean) Method (System.Configuration) | Microsoft...
Writes the contents of this configuration element to the configuration file when implemented in a derived class.
system configurationxmlwriterbooleanmethodmicrosoft