I'm using Excel interop and it seems that this functionality needs to run in the UI thread.
So I execute that from the ProgressChanged backgroundworker event.
Is there a way to have the dowork event (that invoked the progress changed event) interrupt execution until the ProgressChanged event is finished?

Here's how the bg is initialized:

       private void initializeBackgroundWorker()
        {
            bg36 = new BackgroundWorker();
            bg36.DoWork += bg36_DoWork;
            bg36.RunWorkerCompleted += bg36_RunWorkerCompleted;
            bg36.WorkerReportsProgress = true;
            bg36.ProgressChanged += bg36_ProgressChanged;
            bg36.WorkerSupportsCancellation = true;
        }

This is how the process is started:

       private void bg36_DoWork(object sender, DoWorkEventArgs e)
        {
            BackgroundWorker bw = (BackgroundWorker)sender;

This is the call to the UI thread

            bw.ReportProgress(0, "save ledgers");

And this is the routine I would like to complete before the worker continues

       private void bg36_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            statusTextBlock.Text = (string)e.UserState + "\n\n" + Monitor.peek();
            if ((string)e.UserState== "save ledgers")
	        {
		         saveLedgers();
            }
        }