If you're doing this through the designer:Select your column layerGo to the ChartTypeAppearance propertyFind ChartText collectionEdit the collection and add a new item to itSet Column and Row properties to -2Set Visible property to trueor in code:ColumnChartAppearance appearance = new ColumnChartAppearance();ChartTextAppearance chartText = new ChartTextAppearance();chartText.Column = chartText.Row = -2;chartText.ItemFormatString = "<DATA_VALUE:0.##>";chartText.Visible = true;appearance.ChartText.Add(chartText);myLayer.ChartTypeAppearance = appearance;