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        public static bool Save(ListWithChangedEvent Anrufsliste)
        {
            

            try
            {
                xmlSer = new XmlSerializer(typeof(ListWithChangedEvent));

                if (File.Exists(ordner + "Anrufe.xml"))
                    File.Delete(ordner + "Anrufe.xml");

                FileStream serializeStream = new FileStream(ordner + "Anrufe.xml", FileMode.Create);
                xmlSer.Serialize(serializeStream, Anrufsliste);
                serializeStream.Close();

                return true;
            }
            catch
            {
                return false;
            } 
        }                    

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xmlSer = new XmlSerializer(typeof(ListWithChangedEvent));