WmAutoUpdate.TransferManager.AddObserver C# (CSharp) Method

        public void AddObserver(Notification ev)
        {
            ev.AbortUpdateEvent += new Notification.AbortUpdate(Notification_AbortUpdateEvent);
        }

        private void performUpdate(object obj)
        {
            string url = (string)zipFileURL;

            String fullAppName    = callingAssembly.GetName().CodeBase;
            String appPath        = Path.GetDirectoryName(fullAppName);
            String updateDir      = appPath + "\\" + UPDATE_FOLDER_NAME;
            String updateFilename = getFilename(url);
            string updateZip      = updateDir + "\\" + updateFilename;

            // Create directory to store update files
            Directory.CreateDirectory(updateDir);
            TransferManager tm = new TransferManager();

            tm.AddObserver(notification);
            Stream s;

            tm.downloadFile(url, out s, updateZip, notification.trans);
            if (s != null)
            {
                s.Close();
            }

            if (!abortUpdate)
            {
                using (ZipFile zip1 = ZipFile.Read(updateZip))
                {
                    foreach (ZipEntry e in zip1)
                    {
                        e.Extract(updateDir, ExtractExistingFileAction.OverwriteSilently);
                    }
                }

                File.Delete(updateZip);
                string backupDir = appPath + "\\" + BACKUP_FOLDER_NAME;
                if (Directory.Exists(backupDir))
                {
                    Directory.Delete(backupDir, true);
                }
                Directory.CreateDirectory(backupDir);
                foreach (string filepath in Directory.GetFiles(updateDir))
                {
                    string originalFile = appPath + "\\" + getFilenameFromPath(filepath);
                    if (File.Exists(originalFile))
                    {
                        string backupFilepath = backupDir + "\\" + getFilenameFromPath(filepath);
                        File.Move(originalFile, backupFilepath);
                        File.Move(filepath, originalFile);
                    }
                }
                OnUpdateDone();
            }
        }