save:
nChartControl1.Serializer.SaveControlStateToFile(dlg.FileName, (PersistencyFormat.XML), filter);

open:
nChartControl1.Serializer.LoadControlStateFromFile(dlg.FileName, (PersistencyFormat.XML), filter);

i used the above functions for saving chart and open the chart.
what is my problem is, i am unable to add new series after open the saved file.