ArcGIS Pro 2.8 API Reference Guide
IsChecked Property (CheckBox)

ArcGIS.Desktop.Framework.Contracts Namespace > CheckBox Class : IsChecked Property
Gets or sets whether the CheckBox is checked.
Syntax
public new Nullable<bool> IsChecked {get; set;}
Public Shadows Property IsChecked As Nullable(Of Boolean)
Requirements

Target Platforms: Windows 10, Windows 8.1

See Also

Reference

CheckBox Class
CheckBox Members