Hi Neethu,
Thank you for your interest in Syncfusion products.
Issue : Draw Reference line along X or Y axis
You can draw the reference line along with the X axis or Y axis of the chart control by using DrawLine method in ChartAreaPaint event. Please refer to the sample given below in which we have added a reference line in X-axis of the chart.
Sample :
http://websamples.syncfusion.com/samples/Chart.Windows/F73596/main.htmLet me know if you have any questions.
Thanks,
Vinoth