https://learn.microsoft.com/zh-tw/dotnet/api/system.configuration.applicationsettingsbase.settingskey?view=netframework-4.8.1&viewFallbackFrom=windowsdesktop-10.0
ApplicationSettingsBase.SettingsKey Property (System.Configuration) | Microsoft Learn
Gets or sets the settings key for the application settings group.
property systemconfigurationmicrosoftlearn