ArcGIS Pro 2.7 API Reference Guide
IsNullable Property (Attribute)

ArcGIS.Desktop.Editing.Attributes Namespace > Attribute Class : IsNullable Property
Gets whether this attribute value can be null.
Syntax
public bool IsNullable {get;}
Public ReadOnly Property IsNullable As Boolean
Requirements

Target Platforms: Windows 10, Windows 8.1

See Also

Reference

Attribute Class
Attribute Members