private void toolStripMenuItemAddCaptureGroup_Click(object sender, EventArgs e) { using (AddRegexCaptureGroup dlg = new AddRegexCaptureGroup()) { if (dlg.ShowDialog(this) == DialogResult.OK) { textBox1.AppendText("(<" + dlg.CaptureGroupName + ">:" + dlg.RegularExpression + ")"); } } }