XML create and save file

  var dict = VectorElementList.Select((s, i) => new { s, i }).ToDictionary(x => x.i, x => x.s.BestCell);
        XmlSerializer xs = new XmlSerializer(typeof(PolyLabel.Cell));
        TextWriter tw = new StreamWriter(DataStorageBase.ChosenImage);
        for (int i = 0; i < dict.Count; i++)
        {
            xs.Serialize(tw, dict[i]);
        }
        tw.Close();