Sunburst provides various options to format data labels according to your requirements. You can use connecting lines to connect the data labels, set and style borders of data labels, and customize the appearance of data labels.

The topic comprises of three sections:

• Setting and Styling Borders
• Connecting DataLabels to Data Points
• Modifying Appearance

Setting and Styling Borders

To add and style borders to Sunburst data labels, set the Border and BorderStyle properties provided by DataLabel class.

Use the following code snippet to add borders to data labels of Sunburst.

// Enable Border 
sunburst1.DataLabel.Border = true;
            
// Set fill color
sunburst1.DataLabel.BorderStyle.FillColor = Color.Beige;

// Set stroke color and width
sunburst1.DataLabel.BorderStyle.StrokeColor = Color.Gray;
sunburst1.DataLabel.BorderStyle.StrokeWidth = 2;

Connecting DataLabels to Data Points

In case the data labels are placed away from the data points, you can connect them using connecting lines.

To enable connecting lines in Sunburst chart, you need to use the ConnectingLine property.

Use the following code snippet to set the connecting lines.

//Enable connecting line
sunburst1.DataLabel.ConnectingLine = true;

Modifying Appearance

Sunburst includes various styling options, to enhance the clarity of data labels. To modify the appearance of Sunburst chart, you need to use the Style property. It allows you to modify the font family, fill color, use stroke brush for data labels, set width for stroke brush and more.

In the example code, we have modified the font used in the chart and set the stroke width property. Use the following code snippet to modify the appearance of the chart.

// Modifying appearance of data labels
sunburst1.DataLabel.Style.Font = new Font(FontFamily.GenericSansSerif, 8);
sunburst1.DataLabel.Style.StrokeWidth = 2;