private void addFreqButton_Click(object sender, EventArgs e) { using (AddFrequencyForm form = new AddFrequencyForm()) { if (form.ShowDialog() == DialogResult.OK) { ListViewItem item = new ListViewItem(); item.Text = form.Frequency.ToString(); item.SubItems.Add(form.MarkColor.Name); item.SubItems.Add(form.MarkLabel); marksListView.Items.Add(item); } } }