ArcGIS Pro 3.0 API Reference Guide
ArcGIS.Desktop.Mapping Namespace / ProportionalRendererDefinition Class / NullValueSymbol Property

NullValueSymbol Property (ProportionalRendererDefinition)
Gets or sets the symbol used in the renderer to draw features with null values.
Syntax
public CIMSymbolReference NullValueSymbol {get; set;}
Requirements

Target Platforms: Windows 11, Windows 10, Windows 8.1

ArcGIS Pro version: 2.0 or higher.
See Also