Author: PraVeeN - Microsoft MVP

LanScan is a utility for cheking which computer is ON and which computer is OFF now.

This application is developed with Dotnet 2.0 with C# .

Well..., this is the heart code:

private void ThreadProc()
{
pictureBox1.Visible = true;
button1.Enabled = false;
label1.Visible = true;
Ping p = new Ping();
PingReply pr = null;
System.Net.IPAddress ipaddress = null;
string hostname = string.Empty;

for (int i = 1; i < 255; i++)
{
label1.Text = "Checking " + i.ToString() + "/255 Machines";
Application.DoEvents();
ipaddress = System.Net.IPAddress.Parse("192.168.0." + i.ToString());
pr = p.Send(ipaddress, 1);
if (pr.Status.ToString() == "Success")
{
hostname = System.Net.Dns.GetHostByAddress(ipaddress).HostName.ToString();
ListViewItem lv = listView1.Items.Add(ipaddress.ToString());
lv.SubItems.Add(hostname);
lv.SubItems.Add("On");
lv.ForeColor = Color.DarkGreen;
lv = listView2.Items.Add(ipaddress.ToString());
lv.SubItems.Add(hostname);
lv.SubItems.Add("On");
lv.ForeColor = Color.DarkGreen;
}
else
{
ListViewItem lv = listView1.Items.Add(ipaddress.ToString());
lv.SubItems.Add("");
lv.SubItems.Add("Off");
lv.ForeColor = Color.Red;
lv = listView3.Items.Add(ipaddress.ToString());
lv.SubItems.Add("");
lv.SubItems.Add("Off");
lv.ForeColor = Color.Red;
}
label2.Text = "Total " + listView2.Items.Count + " Machines ON";
}
label1.Visible = false;
button1.Enabled = true;
pictureBox1.Visible = false;
}