<PackageReference Include="System.Configuration.ConfigurationManager" Version="10.0.0-preview.1.25080.5" />

PropertyValueOrigin

public enum PropertyValueOrigin
Specifies the level in the configuration hierarchy where a configuration property value originated.
Default = 0

The configuration property value originates from the DefaultValue property.

The configuration property value is inherited from a parent level in the configuration.

SetHere = 2

The configuration property value is defined at the current level of the hierarchy.