The created section handler object.
Instances of the System.Configuration.IConfigurationSectionHandler class must be thread safe and stateless. The IConfigurationSectionHandler.Create(object, object, System.Xml.XmlNode) method must be callable from multiple threads simultaneously.
Furthermore, the configuration object generated by the IConfigurationSectionHandler.Create(object, object, System.Xml.XmlNode) method must be thread safe and immutable. Because the configuration objects are cached by the configuration system, it is important not to modify the parent argument to IConfigurationSectionHandler.Create(object, object, System.Xml.XmlNode). For example, if the return value of IConfigurationSectionHandler.Create(object, object, System.Xml.XmlNode) is only a small modification of the parent, actual modifications must be made on a clone of the parent, not the original.