public static void XmlParserAds(Advertisement crtAd)//Receives a Advertisement instance and writes to its respective XML file
{
XDocument doc = XDocument.Load(xmlAds);
XElement school = doc.Element("Ads");
school.Add(new XElement("Ad",
new XElement("CompanyName", crtAd.CompanyName),
new XElement("Price", crtAd.Price.ToString()),
new XElement("Active", crtAd.GetStatus()),
new XElement("AdBody", crtAd.AdBody),
new XElement("CreationDate", crtAd.CreationDate),
new XElement("ExpirationDate", crtAd.ExpirationDate.ToString()),
new XElement("URL", crtAd.Url),
new XElement("Image", crtAd.ImgPath)
));
doc.Save(xmlAds);
}