private void radButton1_Click(object sender, EventArgs e) { offlinePasswd = new OfflinePasswdForm(); offlinePasswd.ShowDialog(); //获得离线密码 if (offlinePasswd.DialogResult == DialogResult.Cancel) { return; } ListBox.SelectedObjectCollection checkedToDownload = listBox1.SelectedItems; //选择的那门课程 ____fDataModule.ServerToBriefcase (Properties.Settings.Default.CurrentDownloadPasswd, checkedToDownload); //开始下载课程信息 }