Win Form Charting

Question

I may be asking the wrong question, but what I need is to add a \"Guide Line\" to my windows form chart. In other words I have a chart with a simple data series and I need t

Answer 1

You can add a StripLine.

Use StripWidth property to set line position:

var series = chart1.Series[0]; //series object
var chartArea = chart1.ChartAreas[series.ChartArea];
chartArea.AxisY.StripLines.Add(new StripLine
                                           {
                                               BorderDashStyle = ChartDashStyle.Dash,
                                               BorderColor = Color.DarkBlue,
                                               StripWidth = 80//Here is your y value
                                           });

UPDATE: Previous version of this answer used Interval instead of StripWidth. As @dthor correctly pointed out in the comments setting the Interval will draw a repeated strip line. In the example above, Interval is set to 0 by default.