How to solve exception “SocketException was unhandled” no such host is known

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C#

sockets

exceptions

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i am trying to get network connected computers ip's of selected from the listview by checkboxes code is given below , answer will be appriciated and thanks in advance reply urgent kindly

private void Form1_Load(object sender, EventArgs e) {

NetworkBrowser nb = new NetworkBrowser();
foreach (string pc in nb.getNetworkComputers())
{
listViewEx1.Items.Add(pc, 0);

}

}

private void button1_Click(object sender, EventArgs e)
{
foreach (ListViewItem chkd in listViewEx1.CheckedItems)
{
IPAddress[] addresslist = Dns.GetHostAddresses(chkd.ToString());
foreach (IPAddress ip in addresslist)
{
MessageBox.Show(ip.ToString());
}

// MessageBox.Show(chkd.ToString());

}
}