Sets or returns where the data label should be placed relative to its data point

public DataLabelPlacementType DataLabelPlacement{ get; set; }

Public Property DataLabelPlacement() As DataLabelPlacementType

Set the position of each SeriesDataLabel using the DataLabelPlacementType enum.

//--- Create chart
Chart chart = ws.Charts.CreateChart(ChartType.Column.Stacked, ws.CreateAnchor(10, 0, 0, 0));

//--- Create data series
Series series = chart.SeriesCollection.CreateSeries("A1:A10");

//--- Set the data label position for the first SeriesDataLabel to OutsideEnd
series[0].Label.DataLabelPlacement = DataLabelPlacementType.OutsideEnd;

'--- Create chart
Dim chart As Chart = ws.Charts.CreateChart(ChartType.Column.Stacked, ws.CreateAnchor(10, 0, 0, 0))

'--- Create data series
Dim series As Series = chart.SeriesCollection.CreateSeries("A1:A10")

'--- Set the data label position for the first SeriesDataLabel to OutsideEnd
series(0).Label.DataLabelPlacement = DataLabelPlacementType.OutsideEnd