How to get list of all machine ip addresses in lan using C# in windows application

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C#4.0

I have a doubt on my code,how to all system ip address and udp port numbers and display in Combo box using c# in windows application. I tried but i don't get correct output.
I got error Message

No such host is known

Please Help

What I have tried:

    Process netUtility = new Process();

    netUtility.StartInfo.FileName = "net.exe";

    netUtility.StartInfo.CreateNoWindow = true;

    netUtility.StartInfo.Arguments = "view";

    netUtility.StartInfo.RedirectStandardOutput = true;

    netUtility.StartInfo.UseShellExecute = false;

    netUtility.StartInfo.RedirectStandardError = true;

    netUtility.Start();
    StreamReader streanreader = new StreamReader (netUtility.StandardOutput.BaseStream, netUtility.StandardOutput.CurrentEncoding);
    string line = "";


    while ((line = streanreader.ReadLine()) != null)
    {
        if (line.StartsWith("\\"))
        {

            string myIP = Convert.ToString(System.Net.Dns.GetHostEntry(line.Substring(2).Substring(0, line.Substring(2).IndexOf(" ")).ToUpper()).AddressList[0].ToString());
            textclientip.Text=listBox1.Items.Add(myIP).ToString();
            comboBox1.Items.Add(myIP);
            //textclientip.Text = listBox1.Text;
        }
    }

    streanreader.Close();
    netUtility.WaitForExit(1000);

}