<PackageReference Include="System.Configuration.ConfigurationManager" Version="9.0.2" />

SettingsSerializeAs

public enum SettingsSerializeAs
Determines the serialization scheme used to store application settings.
Binary = 2

The settings property is serialized using binary object serialization.

The settings provider has implicit knowledge of the property or its type and picks an appropriate serialization mechanism. Often used for custom serialization.

String = 0

The settings property is serialized as plain text.

Xml = 1

The settings property is serialized as XML using XML serialization.