internal virtual void InternalWriteStartObject(XmlWriterDelegator writer, object graph) { DiagnosticUtility.DebugAssert("XmlObjectSerializer.InternalWriteStartObject should never get called"); throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new NotSupportedException()); } internal virtual void InternalWriteObjectContent(XmlWriterDelegator writer, object graph)