List<Customer> lst = new List<Customer>(); Customer c = new Customer(); c.ID = 1; c.Name = "one"; lst.Add(c); c = new Customer(); c.ID = 2; c.Name = "tow"; lst.Add(c); XmlDocument xd = new XmlDocument(); using (StringWriter sw = new StringWriter()) {     XmlSerializer xz = new XmlSerializer(lst.GetType());     xz.Serialize(sw, lst);     Console.WriteLine(sw.ToString());     xd.LoadXml(sw.ToString());     xd.Save("c:\\1.xml"); } List<Customer> lst2 = new List<Customer>(); using (XmlReader reader = XmlReader.Create("c:\\1.xml")) {     XmlSerializer xz = new XmlSerializer(lst2.GetType());     lst2=(List<Customer>)xz.Deserialize(reader);     Console.WriteLine(reader.ToString()); }