/// <summary>
        /// Writes XML elements.
        /// </summary>
        /// <param name="writer">The writer.</param>
        internal override void WriteElementsToXml(EwsServiceXmlWriter writer)
        {
            writer.WriteElementValue(XmlNamespace.Messages, XmlElementNames.Verb, this.Verb);

            writer.WriteStartElement(XmlNamespace.Messages, XmlElementNames.Parameter);
            writer.WriteNode(this.Parameter);
            writer.WriteEndElement();
        }