public override void PerformAction(AppWorkspace appWorkspace)
        {
            DocumentWorkspace originalDW = appWorkspace.ActiveDocumentWorkspace;

            int oldLatency = 10;

            try
            {
                oldLatency = appWorkspace.Widgets.DocumentStrip.ThumbnailUpdateLatency;
                appWorkspace.Widgets.DocumentStrip.ThumbnailUpdateLatency = 0;
            }

            catch (NullReferenceException)
            {
                // See bug #2544
            }

            List <DocumentWorkspace> unsavedDocs = new List <DocumentWorkspace>();

            foreach (DocumentWorkspace dw in appWorkspace.DocumentWorkspaces)
            {
                if (dw.Document != null && dw.Document.Dirty)
                {
                    unsavedDocs.Add(dw);
                }
            }

            if (unsavedDocs.Count == 1)
            {
                CloseWorkspaceAction cwa = new CloseWorkspaceAction(unsavedDocs[0]);
                cwa.PerformAction(appWorkspace);
                this.cancelled = cwa.Cancelled;
            }
            else if (unsavedDocs.Count > 1)
            {
                using (UnsavedChangesDialog dialog = new UnsavedChangesDialog())
                {
                    dialog.DocumentClicked += (s, e2) => { appWorkspace.ActiveDocumentWorkspace = e2.Data; };

                    dialog.Documents = unsavedDocs.ToArray();

                    if (appWorkspace.ActiveDocumentWorkspace.Document.Dirty)
                    {
                        dialog.SelectedDocument = appWorkspace.ActiveDocumentWorkspace;
                    }

                    Form mainForm = appWorkspace.FindForm();
                    if (mainForm != null)
                    {
                        PdnBaseForm asPDF = mainForm as PdnBaseForm;

                        if (asPDF != null)
                        {
                            asPDF.RestoreWindow();
                        }
                    }

                    DialogResult dr = Utility.ShowDialog(dialog, appWorkspace);

                    switch (dr)
                    {
                    case DialogResult.Yes:
                    {
                        foreach (DocumentWorkspace dw in unsavedDocs)
                        {
                            appWorkspace.ActiveDocumentWorkspace = dw;
                            bool result = dw.DoSave();

                            if (result)
                            {
                                appWorkspace.RemoveDocumentWorkspace(dw);
                            }
                            else
                            {
                                this.cancelled = true;
                                break;
                            }
                        }
                    }
                    break;

                    case DialogResult.No:
                        this.cancelled = false;
                        break;

                    case DialogResult.Cancel:
                        this.cancelled = true;
                        break;

                    default:
                        throw new InvalidEnumArgumentException();
                    }
                }
            }

            try
            {
                appWorkspace.Widgets.DocumentStrip.ThumbnailUpdateLatency = oldLatency;
            }

            catch (NullReferenceException)
            {
                // See bug #2544
            }

            if (this.cancelled)
            {
                if (appWorkspace.ActiveDocumentWorkspace != originalDW &&
                    !originalDW.IsDisposed)
                {
                    appWorkspace.ActiveDocumentWorkspace = originalDW;
                }
            }
            else
            {
                UI.SuspendControlPainting(appWorkspace);

                foreach (DocumentWorkspace dw in appWorkspace.DocumentWorkspaces)
                {
                    appWorkspace.RemoveDocumentWorkspace(dw);
                }

                UI.ResumeControlPainting(appWorkspace);
                appWorkspace.Invalidate(true);
            }
        }
        public override void PerformAction(AppWorkspace appWorkspace)
        {
            DocumentWorkspace dw;

            if (this.closeMe == null)
            {
                dw = appWorkspace.ActiveDocumentWorkspace;
            }
            else
            {
                dw = this.closeMe;
            }

            if (dw != null)
            {
                if (dw.Document == null)
                {
                    appWorkspace.RemoveDocumentWorkspace(dw);
                }
                else if (!dw.Document.Dirty)
                {
                    appWorkspace.RemoveDocumentWorkspace(dw);
                }
                else
                {
                    appWorkspace.ActiveDocumentWorkspace = dw;

                    TaskButton saveTB = new TaskButton(
                        ImageResource.Get("Icons.MenuFileSaveIcon.png").Reference,
                        PdnResources.GetString("CloseWorkspaceAction.SaveButton.ActionText"),
                        PdnResources.GetString("CloseWorkspaceAction.SaveButton.ExplanationText"));

                    TaskButton dontSaveTB = new TaskButton(
                        ImageResource.Get("Icons.MenuFileCloseIcon.png").Reference,
                        PdnResources.GetString("CloseWorkspaceAction.DontSaveButton.ActionText"),
                        PdnResources.GetString("CloseWorkspaceAction.DontSaveButton.ExplanationText"));

                    TaskButton cancelTB = new TaskButton(
                        ImageResource.Get("Icons.CancelIcon.png").Reference,
                        PdnResources.GetString("CloseWorkspaceAction.CancelButton.ActionText"),
                        PdnResources.GetString("CloseWorkspaceAction.CancelButton.ExplanationText"));

                    string title           = PdnResources.GetString("CloseWorkspaceAction.Title");
                    string introTextFormat = PdnResources.GetString("CloseWorkspaceAction.IntroText.Format");
                    string introText       = string.Format(introTextFormat, dw.GetFriendlyName());

                    Image  thumb     = appWorkspace.GetDocumentWorkspaceThumbnail(dw);
                    Bitmap taskImage = new Bitmap(thumb.Width + 2, thumb.Height + 2, PixelFormat.Format32bppArgb);

                    using (Graphics g = Graphics.FromImage(taskImage))
                    {
                        g.Clear(Color.Transparent);

                        g.DrawImage(
                            thumb,
                            new Rectangle(1, 1, thumb.Width, thumb.Height),
                            new Rectangle(0, 0, thumb.Width, thumb.Height),
                            GraphicsUnit.Pixel);

                        Utility.DrawDropShadow1px(g, new Rectangle(0, 0, taskImage.Width, taskImage.Height));
                    }

                    Form mainForm = appWorkspace.FindForm();
                    if (mainForm != null)
                    {
                        PdnBaseForm asPDF = mainForm as PdnBaseForm;

                        if (asPDF != null)
                        {
                            asPDF.RestoreWindow();
                        }
                    }

                    TaskButton clickedTB = TaskDialog.Show(
                        appWorkspace,
                        Utility.ImageToIcon(ImageResource.Get("Icons.WarningIcon.png").Reference, false),
                        title,
                        taskImage,
                        false,
                        introText,
                        new TaskButton[] { saveTB, dontSaveTB, cancelTB },
                        saveTB,
                        cancelTB,
                        340);

                    if (clickedTB == saveTB)
                    {
                        if (dw.DoSave())
                        {
                            this.cancelled = false;
                            appWorkspace.RemoveDocumentWorkspace(dw);
                        }
                        else
                        {
                            this.cancelled = true;
                        }
                    }
                    else if (clickedTB == dontSaveTB)
                    {
                        this.cancelled = false;
                        appWorkspace.RemoveDocumentWorkspace(dw);
                    }
                    else
                    {
                        this.cancelled = true;
                    }
                }
            }

            Utility.GCFullCollect();
        }