public void OneHdred_ms(object sender, ElapsedEventArgs e) { hWndListManager objWndListManager = new hWndListManager(); if (hWndNameListBox.InvokeRequired == true || hWndListBox.InvokeRequired == true) { RefreshListBoxDelegate ListBoxDelegator = new RefreshListBoxDelegate(objWndListManager.RefreshListBox); this.Invoke(ListBoxDelegator, hWndNameListBox, hWndListBox); } else { objWndListManager.RefreshListBox(hWndNameListBox, hWndListBox); } }