//add code private void button20_Click(object sender, EventArgs e) { if (textBox2.Text.Length != 6 && textBox2.Text.Length != 8) { label_error.Visible = true; return; } if (textBox2.Text.Contains(" ")) { label_error.Visible = true; return; } foreach (ListViewItem item in listView1.Items) { if (item.Text == textBox2.Text) { MessageBox.Show(Program.ResourceManager.GetString("Message_CodeAlreadyExistInTheList")); return; } } FormEnterName comment = new FormEnterName(Program.ResourceManager.GetString("Title_EnterComment"), Program.ResourceManager.GetString("Title_GameGenieCode"), true, false); if (comment.ShowDialog(this) == System.Windows.Forms.DialogResult.OK) { listView1.Items.Add(textBox2.Text); listView1.Items[listView1.Items.Count - 1].Checked = true; listView1.Items[listView1.Items.Count - 1].SubItems.Add(comment.EnteredName); } }