[CONNECT .NET] Disable 'No Workset Alert'

My AddIn processes a list of DGN files.  For each file, it uses Session.NewDesignFile().  In many cases, that pops modal dialog No Workspace Alert...

No Workspace Alert

I want to eliminate that dialog so the list can be processed with no human intervention.  In another post about C++,  suggested unpublished function mdlSystem_setBatchProcessingState().  Is there a .NET equivalent?