1:
2:
3:
4:
5:
6:
7:
8:
9:
10:
11:
12:
13:
14:
15:
16:
17:
18:
19:
20:
21:
22:
23:
24:
25:
26:
27:
28:
29:
30:
31:

private void button_ping_Click(object sender, EventArgs e)
        {
            Ping pingSender = new Ping();
            PingOptions options = new PingOptions();
            options.DontFragment = true;
            for (int lauf = 0; lauf < 255; lauf++)
            {
                int ipadresse = 0;
                String ip;
                ipadresse += lauf;
                ip = "192.168.2." + ipadresse.ToString();
                progressBar.Maximum = 255;
                progressBar.Step = 1;
                progressBar.PerformStep();
                // Create a buffer of 32 bytes of data to be transmitted.
                string data = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
                byte[] buffer = Encoding.ASCII.GetBytes(data);
                int timeout = 120;
                PingReply reply = pingSender.Send(ip, timeout, buffer, options);
                if (reply.Status == IPStatus.Success)
                {
                    listBox_devices.Items.Add("Address: {0}" + reply.Address.ToString());
                    listBox_devices.Items.Add("RoundTrip time: {0}"+ reply.RoundtripTime);
                    listBox_devices.Items.Add("Time to live: {0}" + reply.Options.Ttl);
                    listBox_devices.Items.Add("Don't fragment: {0}" + reply.Options.DontFragment);
                    listBox_devices.Items.Add("Buffer size: {0}" + reply.Buffer.Length);
                }
            }


        }                    

1:
2:

progressBar.Maximum = 255;
progressBar.Step = 1;                    

1:
2:
3:
4:

int ipadresse = 0;
String ip;
ipadresse += lauf;
ip = "192.168.2." + ipadresse.ToString();                    

1:
2:

String ip;
ip = "192.168.2." + lauf.ToString();