This is how I solved my issue.
EnumerableDataSource<TPoint> edc;
edc= new EnumerableDataSource<TPoint>(List_Of_TPoint);
edc.SetXMapping(x => dateAxis.ConvertToDouble(x.X));
edc.SetYMapping(y => Convert.ToDouble(y.Y));
edc.AddMapping(CircleElementPointMarker.ToolTipTextProperty, s => String.Format("Y-Data : {0}\nX-Data : {1}", s.Y, s.X));
I just added above mapping while creating my EnumerableDataSource. And then added the edc to plotter.
plotter.AddLineGraph(
edc,
new Pen(Brushes.Transparent, 3),
new CircleElementPointMarker
{
Size = 15,
Brush = border,
Fill = c2
},
null
);