https://learn.microsoft.com/ko-kr/dotnet/api/system.windows.data.datasourceprovider.datachanged?view=netframework-4.8.1&viewFallbackFrom=windowsdesktop-6.0
DataSourceProvider.DataChanged Event (System.Windows.Data) | Microsoft Learn
Occurs when the Data property has a new value.
event systemdatachangedwindowsmicrosoftlearn