vb.net - BackgroundWorker's ProgressChanged not updating UI until end of work loop -


i coding wpf application grab email's off of imap account, , export them user-selected folder.

i use backgroundworker download emails. however, ui isn't being updated until loop over.

any tips appreciated. 

class mainwindow     public mailrepo mailrepository     private bw_connect new backgroundworker     private bw_save new backgroundworker      public sub new()         initializecomponent()          bw_connect.workerreportsprogress = true         bw_connect.workersupportscancellation = true         addhandler bw_connect.dowork, addressof bw_connect_dowork          bw_save.workerreportsprogress = true         bw_save.workersupportscancellation = true         addhandler bw_save.dowork, addressof bw_save_dowork         addhandler bw_save.progresschanged, addressof bw_save_progresschanged      end sub 
    private sub bw_save_dowork(byval sender object, byval e doworkeventargs)         dim worker backgroundworker = ctype(sender, backgroundworker)          if bw_connect.cancellationpending = true             e.cancel = true         else             saveemails()         end if     end sub 
private sub saveemails()     dim allmails ienumerable(of message)     'get emails in mailbox     try         dim mailbox string         dispatcher.invoke(directcast(sub()                                          mailbox = comboboxemailfolders.selectedvalue                                      end sub, action))         allmails = mailrepo.getallmails(mailbox)     catch i4e imap4exception         msgbox("error: folder not found" & vbcrlf & i4e.message)         return     end try     dim msg message     dim msgint integer = 1     'save each message     each msg in allmails         bw_save.reportprogress(100 / allmails.count * msgint, nothing)         savemessage(msg)         msgint += 1     next end sub 
private sub bw_save_progresschanged(byval sender object, byval e progresschangedeventargs)         dim percentdone string = e.progresspercentage.tostring() & "%"         updatestatus("saving emails " & percentdone & " done.")         progressbarstatus.value = e.progresspercentage     end sub


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