public string Format(List <Sentence> items) { TestObjects test = new TestObjects(); test.AddRange(items); XmlSerializer xmlSerializer = new XmlSerializer(typeof(TestObjects)); XmlSerializerNamespaces nameSpace = new XmlSerializerNamespaces(); nameSpace.Add("", ""); var xml = ""; var settings = new XmlWriterSettings { Indent = true, NewLineOnAttributes = true }; using (var sww = new StringWriter()) { using (XmlWriter writer = XmlWriter.Create(sww, settings)) { xmlSerializer.Serialize(writer, test, nameSpace); xml = sww.ToString(); } } return(xml); }