For point 2, you can still set the XValueType
to DateTime
but with proper format in LabelStyle
.
chart1.Series[SeriesName].XValueType = ChartValueType.DateTime;
// Use the required format. I used the below format as example.
chart1.ChartAreas[ChartName].AxisX.LabelStyle.Format = "dd/mm/yy hh:mm:ss";
For point 1, add a StripLine
to the Y-Axis of the chartarea.
StripLine stripline = new StripLine();
stripline.Interval = 0;
stripline.IntervalOffset = average value of the y axis; eg:35
stripline.StripWidth = 1;
stripline.BackColor = Color.Blue;
chart1.ChartAreas[ChartAreaName].AxisY.StripLines.Add(stripline);