The namespace contains classes used to read the values found in application configuration files under the system.xml.serialization section. The classes in this namespace are used by the serialization infrastructure to handle the configuration elements and cannot be used directly. For more information about configuration files, see Configuration File Schema for the .NET Framework. Instead, to configure the or , create an application configuration file and use the following XML elements: <system.xml.serialization> Element <schemaImporterExtensions> Element <add> Element for <xmlSchemaImporterExtensions> <dateTimeSerialization> Element <xmlSerializer> Element