You can subscribe to the following events
- CheckForUpdateCompleted - Occurs when CheckForUpdateAsync is complete.
- CheckForUpdateProgressChanged - occurs when an update is available for calling CheckForUpdateAsync.
- DownloadFileGroupCompleted - Appears in the main thread of the application when the file download is completed.
- DownloadFileGroupProgressChanged - occurs when status information is available during the download process of a file initiated by a call to DownloadFileGroupAsync.
- UpdateCompleted - , ClickOnce UpdateAsync.
- UpdateProgressChanged - , ClickOnce , UpdateAsync.
. http://msdn.microsoft.com/en-us/library/system.deployment.application.applicationdeployment_events.aspx