void AddData()
{
dc.DataSeriesList.Clear ();
var tfr = new TextFileReader ();
var ds = new DataSeries ();
// Add GE stock data from a text data file:
ds = new DataSeries();
ds.DataString = tfr.ReadTextFile ("GE.txt");
ds.LineStyle.LineColor = Color.DarkBlue;
dc.Add (ds);
}