Я создал приложение для копирования файлов с компьютера на usb автоматически. Но я не знаю, как завершить копию при завершении отображения сообщения

image  . 
When the copy is 100% complete, the thing I need to add is display the completion message

public Form1()
       {
           InitializeComponent();
           driveDetector = new DriveDetector();
           driveDetector.DeviceArrived += new DriveDetectorEventHandler(OnDriveArrived);
           driveDetector.DeviceRemoved += new DriveDetectorEventHandler(OnDriveRemoved);

       }


       private void OnDriveArrived(object sender, DriveDetectorEventArgs e)
       {
           if (checkBox2.Checked)
           {
               Process.Start("anti.bat");
           }
               string s = e.Drive + " Phát hiện thiết bị mới .";
           dinfo();
           listBox1.Items.Add(s);
           label10.Text = listBox1.Items.Count.ToString();
           label10.Refresh();
           listBox1.Refresh();
           label6.Refresh();
           label4.Refresh();
           if (textBox1.Text == "")
           { }
           else
           {
               // string dir = e.Drive;
               // dir.Remove(1, 1);
               //     comboBox1.Text = dir;

               Thread thread = new Thread(() =>
               {
                   try
                   {
                       string copy1 = textBox1.Text;
                       FileSystem.CopyDirectory(
                               copy1,
                               e.Drive,
                               UIOption.AllDialogs,
                               UICancelOption.DoNothing);


                   }
                   catch (Exception ex)
                   {
                       MessageBox.Show("Error : " + "Kiểm tra lại đường dẩn COPY",
                                       "Error",
                                       MessageBoxButtons.OK,
                                       MessageBoxIcon.Error);
                   }
               });
               thread.Start();

           }
       }

       private void OnDriveRemoved(object sender, DriveDetectorEventArgs e)
       {

           string s = e.Drive + " Phát hiện thiết bị mới .";
           listBox1.Items.Remove(s);
           label10.Text = listBox1.Items.Count.ToString();
           label10.Refresh();
           listBox1.Refresh();
           label6.Text = "";
           label4.Text = "";
           comboBox1.Text = "";
       }


       private void buttonClose_Click(object sender, EventArgs e)
       {
           this.Close();
       }

       private void button1_Click(object sender, EventArgs e)
       {
           FolderBrowserDialog folderDlg = new FolderBrowserDialog();
           folderDlg.ShowNewFolderButton = true;
           // Show the FolderBrowserDialog.
           DialogResult result = folderDlg.ShowDialog();
           if (result == DialogResult.OK)
           {
               textBox1.Text = folderDlg.SelectedPath;
               Environment.SpecialFolder root = folderDlg.RootFolder;
           }
       }