The two methods, attaching the ChartLabel by data coordinate and attaching the ChartLabel by data point, can be combined so that a ChartLabel is attached to a location whose X-coordinate is specified by a data point and whose Y-coordinate is specified by a chart value. Note that this method is not supported in Pie charts.

To attach the ChartLabel by data point and Y value, set the AttachMethod property to AttachMethodEnum.DataIndexY, and then under the AttachMethodData object set the GroupIndex, SeriesIndex, PointIndex, and Y properties.

To write code in Visual Basic

With C1Chart1.ChartLabels.LabelsCollection(0)
        .AttachMethod = AttachMethodEnum.DataIndex
        .AttachMethodData.GroupIndex = 0
        .AttachMethodData.SeriesIndex = 1
        .AttachMethodData.PointIndex = 2
        .AttachMethodData.Y = 15.8
End With

To write code in C#

C1.Win.C1Chart.Label lab = c1Chart1.ChartLabels.LabelsCollection[0];
lab.AttachMethod = AttachMethodEnum.DataIndex;
lab.AttachMethodData.GroupIndex = 0;
lab.AttachMethodData.SeriesIndex = 1;
lab.AttachMethodData.PointIndex = 2;
lab.AttachMethodData.Y = 15.8;

In this example, the ChartLabel location is specified as follows:

• The X-coordinate of the second point in the first data series becomes the X-coordinate of the chart label.
• The Y-coordinate specified by the Y property becomes the Y-coordinate of the chart label.

For more information on how to attach the chart label by data point at design time see, Attach by Data Index.