Ping ping = new Ping();

//Router  0
PingReply pingresult = ping.Send(textBoxRouter0.Text, timeout, buffer, options);
if (pingresult.Status.ToString() == "Success")
{
    pictureBoxRouter0.Image = Properties.Resources.router_online;

    //A > B
    PingReply serialAB1 = ping.Send("192.168." + textBoxSerialAB.Text + ".2", timeout);
    if (serialAB1.Status.ToString() == "Success") { _statusAB1 = " | UP"; } else { _statusAB1 = " | DOWN"; }

    toolTip0.SetToolTip(pictureBoxRouter0, "Ethernet: " + textBoxRouter0.Text + " | UP" + Environment.NewLine + "Serial 0: Not needed" + Environment.NewLine + "Serial 1: " + "192.168." + textBoxSerialAB.Text + ".1" + _statusAB1);

    richTextBoxOutput.Text += "-------------------------------------------";
    richTextBoxOutput.Text += Environment.NewLine + "ROUTER - A";
    richTextBoxOutput.Text += Environment.NewLine;
    richTextBoxOutput.Text += Environment.NewLine + "Ethernet: " + pingresult.Address.ToString();
    richTextBoxOutput.Text += Environment.NewLine + "Serial 0: " + "Not needed";
    richTextBoxOutput.Text += Environment.NewLine + "Serial 1: " + "192.168." + textBoxSerialAB.Text + ".1";
    richTextBoxOutput.Text += Environment.NewLine;
    richTextBoxOutput.Text += Environment.NewLine + "Response time: " + pingresult.RoundtripTime + "ms";
    richTextBoxOutput.Text += Environment.NewLine + "-------------------------------------------";
}
else
{
    pictureBoxRouter0.Image = Properties.Resources.router_offline;

    //A > B
    PingReply serialAB1 = ping.Send("192.168." + textBoxSerialAB.Text + ".2", timeout);
    if (serialAB1.Status.ToString() == "Success") { _statusAB1 = " | UP"; } else { _statusAB1 = " | DOWN"; }

    toolTip0.SetToolTip(pictureBoxRouter0, "Ethernet: " + textBoxRouter0.Text + " | DOWN" + Environment.NewLine + "Serial 0: " + "Not needed" + Environment.NewLine + "Serial 1: " + "192.168." + textBoxSerialAB.Text + ".1" + _statusAB1);
}