public XmlElement ToXmlElement(XmlHelper helper)
{
var xmlElement = helper.CreateElement(nameof(MonthYearPeriodModel).Replace("Model", string.Empty));
xmlElement.AppendChild(helper.CreateElement(nameof(DateFrom), DateFrom.ToXmlElement(helper)));
xmlElement.AppendChild(helper.CreateElement(nameof(DateTo), DateTo.ToXmlElement(helper)));
return(xmlElement);
}