ArcGIS Pro 3.0 API Reference Guide
ArcGIS.Core.Data Namespace / Field Class / IsNullable Property

IsNullable Property (Field)
Gets a value indicating whether this field can contain null values.
Syntax
public bool IsNullable {get;}
Requirements

Target Platforms: Windows 11, Windows 10, Windows 8.1

ArcGIS Pro version: 2.0 or higher.
See Also