//tcpdump filter to capture only TCP/IP packets if filter = "ip and tcp" private void SetFilter(object sender, ExecutedRoutedEventArgs e) { SetFilterUtil setFilterUtil = new SetFilterUtil(filterRule); setFilterUtil.Visibility = System.Windows.Visibility.Visible; setFilterUtil.ApplyFilterRuleEvent += new SetFilterUtil.ApplyFilterRuleHandler(setFilterUtil_ApplyFilterRuleEvent); //device.Filter = filter; }