using (var progress = new Progress("SimpleProgress"))
{
    progress.ShowImmediately();

    //part 1
   progress.BeginPart(25.0, "");
   progress.SetActionText("part1");
   progress.SetNeededSteps(1);
   progress.Step(1);
   System.Threading.Thread.Sleep(2500);    // TODO: Some processing
   progress.EndPart(false);

   //part 2
   progress.BeginPart(30.0, "");
   progress.SetNeededSteps(3);            // call SetNeededSteps with the count of steps following
   progress.SetActionText("part2 step1");
   progress.Step(1);
   System.Threading.Thread.Sleep(1000);    // TODO: Some processing

   progress.SetActionText("part2 step2");
   progress.Step(1);
   System.Threading.Thread.Sleep(1000);    // TODO: Some processing

   progress.SetActionText("part2 step3");
   progress.Step(1);
   System.Threading.Thread.Sleep(1000);    // TODO: Some processing
   progress.EndPart(false);

   //part 3
   progress.BeginPart(45.0, "");          // Here is a sum of 100% reached!
   progress.SetActionText("part3");
   progress.SetNeededSteps(1);
   progress.Step(1);
   System.Threading.Thread.Sleep(4500);    // TODO: Some processing
   progress.EndPart(true);
}

using (var progress = new Progress("SimpleProgress"))
{
    progress.SetAllowCancel(true);
    progress.SetAskOnCancel(true);
    progress.SetTitle("Replace parts");
    progress.ShowImmediately();

    var finder = new DMObjectsFinder(oProject);
    var articleReferences = finder.GetArticleReferences(null);
    var nIteration = 0;
    var progressPartInPercentage = 100.0 / articleReferences.Length;
    foreach (var articleReference in articleReferences)
    {
        // Set new values
        progress.BeginPart(progressPartInPercentage, $"Iteration : {nIteration++}");
        articleReference.PartNr = "New part number";
        articleReference.VariantNr = "New variant";
        articleReference.StoreToObject();
        new DeviceService().UpdateDevice(articleReference.ParentObject);
        progress.EndPart();
    }
}