private void backgroundWorker3_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e) { string html = (string)e.Result; WebSurveyPreview wsp = new WebSurveyPreview(html); wsp.ShowDialog(); button1.Enabled = true; button2.Enabled = true; button4.Enabled = true; fastDataListView1.Enabled = true; }