https://learn.microsoft.com/en-us/dotnet/api/system.windows.data.xmldataprovider.isasynchronous?view=netframework-4.8.1&viewFallbackFrom=windowsdesktop-9.0
XmlDataProvider.IsAsynchronous Property (System.Windows.Data) | Microsoft Learn
Gets or sets a value that indicates whether node collection creation will be performed in a worker thread or in the active context.
property systemwindowsdatamicrosoftlearn