private void btnAdd_Click_1(object sender, EventArgs e) { FrmSelectGroup frm = new FrmSelectGroup(); if (frm.ShowDialog() == DialogResult.OK) { foreach (DictionaryEntry de in frm.GroupItems) { if (!groupItems.Contains(de.Key) && !addgroupItems.Contains(de.Key)) { addgroupItems.Add(de.Key, de.Value); ListViewItem listItem = new ListViewItem(); listItem.Text = ((Smmgroup)de.Value).Groupname; listItem.Tag = de.Value; listView.Items.Add(listItem); } } } }