# Manage Callouts in Presentation Charts in .NET

> Create and style callouts in Aspose.Slides for .NET with concise C# code examples, compatible with PPT and PPTX to automate presentation workflows.

Source: https://docs.aspose.com/slides/net/callout/
Updated: 2026-08-05


## **Overview**

This article explains how to work with callouts for chart data labels in Aspose.Slides. It shows how to use the `ShowLabelAsDataCallout` property to display labels as callouts, how to configure callout-related label settings for a doughnut chart, and notes that callouts and their appearance are preserved when presentations are exported to PDF, HTML5, SVG, and raster image formats.

## **Using Callouts**
New property **ShowLabelAsDataCallout** has been added to **DataLabelFormat** class and **IDataLabelFormat** interface, which determines either specified chart's data label will be displayed as data callout or as data label. In the example given below, we have set the Callouts.

```c#
using Aspose.Slides;
using Aspose.Slides.Charts;
using Aspose.Slides.Export;

using (Presentation presentation = new Presentation())
{
    IChart chart = presentation.Slides[0].Shapes.AddChart(ChartType.Pie, 50, 50, 500, 400);
    chart.ChartData.Series[0].Labels.DefaultDataLabelFormat.ShowValue = true;
    chart.ChartData.Series[0].Labels.DefaultDataLabelFormat.ShowLabelAsDataCallout = true;
    chart.ChartData.Series[0].Labels[2].DataLabelFormat.ShowLabelAsDataCallout = false;
    presentation.Save("DisplayChartLabels_out.pptx", SaveFormat.Pptx);
}
```



## **Set a Callout for a Doughnut Chart**
Aspose.Slides for .NET provides support for setting series data label callout shape for a Doughnut chart. Below sample example is given. 

```c#
using System.Drawing;
using Aspose.Slides;
using Aspose.Slides.Charts;

Presentation pres = new Presentation("testc.pptx");
ISlide slide = pres.Slides[0];
IChart chart = slide.Shapes.AddChart(ChartType.Doughnut, 10, 10, 500, 500, false);
IChartDataWorkbook workBook = chart.ChartData.ChartDataWorkbook;
chart.ChartData.Series.Clear();
chart.ChartData.Categories.Clear();
chart.HasLegend = false;
int seriesIndex = 0;
while (seriesIndex < 15)
{
	IChartSeries series = chart.ChartData.Series.Add(workBook.GetCell(0, 0, seriesIndex + 1, "SERIES " + seriesIndex), chart.Type);
	series.Explosion = 0;
	series.ParentSeriesGroup.DoughnutHoleSize = (byte)20;
	series.ParentSeriesGroup.FirstSliceAngle = 351;
	seriesIndex++;
}
int categoryIndex = 0;
while (categoryIndex < 15)
{
	chart.ChartData.Categories.Add(workBook.GetCell(0, categoryIndex + 1, 0, "CATEGORY " + categoryIndex));
	int i = 0;
	while (i < chart.ChartData.Series.Count)
	{
		IChartSeries iCS = chart.ChartData.Series[i];
		IChartDataPoint dataPoint = iCS.DataPoints.AddDataPointForDoughnutSeries(workBook.GetCell(0, categoryIndex + 1, i + 1, 1));
		dataPoint.Format.Fill.FillType = FillType.Solid;
		dataPoint.Format.Line.FillFormat.FillType = FillType.Solid;
		dataPoint.Format.Line.FillFormat.SolidFillColor.Color = Color.White;
		dataPoint.Format.Line.Width = 1;
		dataPoint.Format.Line.Style = LineStyle.Single;
		dataPoint.Format.Line.DashStyle = LineDashStyle.Solid;
		if (i == chart.ChartData.Series.Count - 1)
		{
			IDataLabel lbl = dataPoint.Label;
			lbl.TextFormat.TextBlockFormat.AutofitType = TextAutofitType.Shape;
			lbl.DataLabelFormat.TextFormat.PortionFormat.FontBold = NullableBool.True;
			lbl.DataLabelFormat.TextFormat.PortionFormat.LatinFont = new FontData("DINPro-Bold");
			lbl.DataLabelFormat.TextFormat.PortionFormat.FontHeight = 12;
			lbl.DataLabelFormat.TextFormat.PortionFormat.FillFormat.FillType = FillType.Solid;
			lbl.DataLabelFormat.TextFormat.PortionFormat.FillFormat.SolidFillColor.Color = Color.LightGray;
			lbl.DataLabelFormat.Format.Line.FillFormat.SolidFillColor.Color = Color.White;
			lbl.DataLabelFormat.ShowValue = false;
			lbl.DataLabelFormat.ShowCategoryName = true;
			lbl.DataLabelFormat.ShowSeriesName = false;
			lbl.DataLabelFormat.ShowLabelAsDataCallout = true;
			lbl.DataLabelFormat.ShowLeaderLines = true;
			chart.ValidateChartLayout();
			lbl.AsILayoutable.X = (float)lbl.AsILayoutable.X + (float)0.5;
			lbl.AsILayoutable.Y = (float)lbl.AsILayoutable.Y + (float)0.5;
		}
		i++;
	}
	categoryIndex++;
}
pres.Save("chart.pptx", Aspose.Slides.Export.SaveFormat.Pptx);
```

## **FAQ**

### Are callouts preserved when converting a presentation to PDF, HTML5, SVG, or images?

Yes. Callouts are part of the chart rendering, so when you export to [PDF](/slides/net/convert-powerpoint-to-pdf/), [HTML5](/slides/net/export-to-html5/), [SVG](/slides/net/render-a-slide-as-an-svg-image/), or [raster images](/slides/net/convert-powerpoint-to-png/), they are preserved together with the slide’s formatting.

### Do custom fonts work in callouts, and can their appearance be preserved on export?

Yes. Aspose.Slides supports [embedding fonts](/slides/net/embedded-font/) into the presentation and controls font embedding during exports such as [PDF](/slides/net/convert-powerpoint-to-pdf/), ensuring the callouts look the same across different systems.