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string filename=Server.MapPath("~/test.xml");
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(filename);
xmlDoc.InnerXml = Regex.Replace(xmlDoc.InnerXml, @"(?s)(?<=</?)material(?=>)", "component");
xmlDoc.InnerXml = Regex.Replace(xmlDoc.InnerXml, @"(?s)(?<=</?)name(?=>)", "caption");
xmlDoc.Save(filename);
XElement xexl = XElement.Load(path);
xexl.Elements().ElementAt(0).Name="component";
xexl.Save(path);