One can set the custom point by plotting points on the Chart Area even if they don't belong to a series. These are stored in the ChartControl.CustomPoints collection.They can be used for annotation of interesting data on the chart.
The ChartCustomPoint class can be used to set text, background, border or symbols at a particular point on the chart area.
One can exposed the Custom points in the following four categories,
//Customize the Custom Point
ChartCustomPoint cp1=new ChartCustomPoint();
cp1.PointIndex = 0;
cp1.SeriesIndex = 1;
cp1.CustomType = ChartCustomPointType.PointFollow;
cp1.Text = "(Follows data point)";
cp1.Symbol.Shape = ChartSymbolShape.Circle;
// Adding PoinFollow type CustomPoint
'Customize the Custom Point
Dim cp1 As ChartCustomPoint = New ChartCustomPoint()
cp1.PointIndex = 0
cp1.SeriesIndex = 1
cp1.CustomType = ChartCustomPointType.PointFollow
cp1.Text = "(Follows data point)"
cp1.Symbol.Shape = ChartSymbolShape.Circle
' Adding PoinFollow type CustomPoint
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