private void ButtonDelIp_Click(object sender, EventArgs e) { string text = listBoxIP.SelectedItem.ToString(); DialogResult confirmResult = MessageBox.Show("Are you sure to delete this item?", "Confirm Delete", MessageBoxButtons.YesNo); if (confirmResult != DialogResult.Yes) { buttonDeleteIp.Enabled = false; return; } var dataBase = new SqliteDatabase(labelDB.Text); labelIP.Text = dataBase.DeleteIp(text); ipList.Remove(text); RefreshIp(); buttonDeleteIp.Enabled = false; }