C# extract images from word document

private void getTitle(string path, Document document, DateTime startTime)
        {
            int index = 0;

            foreach (Spire.Doc.Section section in document.Sections)
            {
                foreach (Spire.Doc.Documents.Paragraph paragraph in section.Paragraphs)
                {
                    if (paragraph.Text.StartsWith("Figure"))
                    {
                        string[] split = paragraph.Text.Split(' ');
                        string title = split[0] + " " + split[1];

                        titles.Add(title);

                        index++;
                        timeRemaining = TimeSpan.FromTicks(DateTime.Now.Subtract(startTime).Ticks * (section.Paragraphs.Count - (index + 1)) / (index + 1));
                        estimatedTime = String.Format("{0}h:{1:D2}m:{2:D2}s", (int)timeRemaining.TotalHours, timeRemaining.Minutes, timeRemaining.Seconds);
                        lblRemainingTime.Text = estimatedTime;
                        lblRemainingTime.Update();

                        percentComplete = (int)Math.Round((double)(100 * section.Paragraphs.Count - index) / section.Paragraphs.Count);
                        prgTimeRemaining.Value = percentComplete;
                        lblProgress.Text = percentComplete.ToString() + " %";
                    }
                }
            }
        }

        private void extractImagesFromDocument(string path, Document document, DateTime startTime)
        {
            int index = 0;

            Queue containers = new Queue();
            containers.Enqueue(document);

            while (containers.Count > 0)
            {
                ICompositeObject container = (ICompositeObject)containers.Dequeue();
                DocumentObjectCollection docObjects = container.ChildObjects;
                foreach (DocumentObject docObject in docObjects)
                {
                    if (docObject.DocumentObjectType == DocumentObjectType.Picture)
                    {
                        timeRemaining = TimeSpan.FromTicks(DateTime.Now.Subtract(startTime).Ticks * (titles.Count - (index + 1)) / (index + 1));
                        estimatedTime = String.Format("{0}h:{1:D2}m:{2:D2}s", (int)timeRemaining.TotalHours, timeRemaining.Minutes, timeRemaining.Seconds);
                        lblRemainingTime.Text = estimatedTime;
                        lblRemainingTime.Update();

                        percentComplete = (int)Math.Round((double)(100 * titles.Count - index) / titles.Count);
                        prgTimeRemaining.Value = percentComplete;
                        lblProgress.Text = percentComplete.ToString() + " %";

                        DocPicture picture = docObject as DocPicture;

                        string imageTitle= titles[index];
                        picture.Image.Save(imageTitle + ".png", ImageFormat.Png);
                        index++;
                    }
                    else
                    {
                        if (docObject is ICompositeObject)
                        {
                            containers.Enqueue(docObject as ICompositeObject);
                        }
                    }
                }
            }
            MessageBox.Show("Titles list:" + titles.Count);
            MessageBox.Show("Images count:" + index);
        }

        private void btnSelectDocument1_Click(object sender, EventArgs e)
        {
            startTime = DateTime.Now;

            OpenFileDialog openFileDialog = new OpenFileDialog();
            DialogResult result = openFileDialog.ShowDialog();

            if (result == DialogResult.OK)
            {
                path = txtDocument1.Text = openFileDialog.FileName;
                extension = Path.GetExtension(path);

                newPath = Path.Combine(Path.GetDirectoryName(path), Path.GetFileNameWithoutExtension(path));
                fileName = newPath + " - Copy" + extension;

                File.Copy(path, fileName);

                Document document = new Document();
                document.LoadFromFile(path);

                getTitle(fileName, document, startTime);
                extractImagesFromDocument(fileName, document, startTime);
                MessageBox.Show("Done");
            }
        }