# Manage Chart Data Markers in Presentations in .NET

> Learn how to customize chart data markers in Aspose.Slides for .NET, boosting presentation impact across PPT and PPTX formats with clear C# code examples.

Source: https://docs.aspose.com/slides/net/chart-data-marker/
Updated: 2026-08-05


## **Overview**

This article explains how to work with chart data markers in Aspose.Slides. It shows how to create a chart, access a series and its data points, apply picture fills to markers at the data-point level, adjust marker size, and save the updated presentation. It also notes that standard marker shapes are available through the `MarkerStyleType` enumeration and that marker appearance is preserved when exporting charts to raster formats or SVG.

## **Set Chart Marker Options**
The markers can be set on chart data points inside particular series. In order to set chart marker options. Please follow the steps below:

- Instantiate [Presentation](https://reference.aspose.com/slides/net/aspose.slides/presentation) class.
- Creating the default chart.
- Set the picture.
- Take first chart series.
- Add new data point.
- Write presentation to disk.

In the example given below, we have set the chart marker options on data points level.

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

// Create an instance of Presentation class
using Presentation presentation = new Presentation();

ISlide slide = presentation.Slides[0];

// Creating the default chart
IChart chart = slide.Shapes.AddChart(ChartType.LineWithMarkers, 0, 0, 400, 400);

// Getting the default chart data worksheet index
int defaultWorksheetIndex = 0;

// Getting the chart data worksheet
IChartDataWorkbook fact = chart.ChartData.ChartDataWorkbook;

// Delete demo series
chart.ChartData.Series.Clear();

// Add new series
chart.ChartData.Series.Add(fact.GetCell(defaultWorksheetIndex, 0, 1, "Series 1"), chart.Type);

// Set the picture
using IImage image1 = Images.FromFile("aspose-logo.jpg");
IPPImage imgx1 = presentation.Images.AddImage(image1);

// Set the picture
using IImage image2 = Images.FromFile("Tulips.jpg");
IPPImage imgx2 = presentation.Images.AddImage(image2);

// Take first chart series
IChartSeries series = chart.ChartData.Series[0];

// Add new point (1:3) there.
IChartDataPoint point = series.DataPoints.AddDataPointForLineSeries(fact.GetCell(defaultWorksheetIndex, 1, 1, (double)4.5));
point.Marker.Format.Fill.FillType = FillType.Picture;
point.Marker.Format.Fill.PictureFillFormat.Picture.Image = imgx1;

point = series.DataPoints.AddDataPointForLineSeries(fact.GetCell(defaultWorksheetIndex, 2, 1, (double)2.5));
point.Marker.Format.Fill.FillType = FillType.Picture;
point.Marker.Format.Fill.PictureFillFormat.Picture.Image = imgx2;

point = series.DataPoints.AddDataPointForLineSeries(fact.GetCell(defaultWorksheetIndex, 3, 1, (double)3.5));
point.Marker.Format.Fill.FillType = FillType.Picture;
point.Marker.Format.Fill.PictureFillFormat.Picture.Image = imgx1;

point = series.DataPoints.AddDataPointForLineSeries(fact.GetCell(defaultWorksheetIndex, 4, 1, (double)4.5));
point.Marker.Format.Fill.FillType = FillType.Picture;
point.Marker.Format.Fill.PictureFillFormat.Picture.Image = imgx2;

// Changing the chart series marker
series.Marker.Size = 15;

// Write presentation to disk
presentation.Save("MarkOptions_out.pptx", SaveFormat.Pptx);
```

## **FAQ**

### Which marker shapes are available out of the box?

Standard shapes are available (circle, square, diamond, triangle, etc.); the list is defined by the [MarkerStyleType](https://reference.aspose.com/slides/net/aspose.slides.charts/markerstyletype/) enumeration. If you need a non-standard shape, use a marker with a picture fill to emulate custom visuals.

### Are markers preserved when exporting a chart to an image or SVG?

Yes. When rendering charts to [raster formats](/slides/net/convert-powerpoint-to-png/) or saving [shapes as SVG](/slides/net/render-a-slide-as-an-svg-image/), markers retain their appearance and settings, including size, fill, and outline.