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    <p>A serial port doesn't know what is connected on the other side. You need to try to open each one and send something like <code>"AT\r\n"</code> and expect <code>"OK"</code> to check on which one your modem is connected.</p> <p>EDIT:</p> <pre><code> using System; using System.IO.Ports; using System.Collections; using System.Collections.Generic; using System.Text; private static bool IsModem(string PortName) { SerialPort port= null; try { port = new SerialPort(PortName,9600); //9600 baud is supported by most modems port.ReadTimeout = 200; port.Open(); port.Write("AT\r\n"); //some modems will return "OK\r\n" //some modems will return "\r\nOK\r\n" //some will echo the AT first //so for(int i=0;i&lt;4;i++) //read a maximum of 4 lines in case some other device is posting garbage { string line = port.ReadLine(); if(line.IndexOf("OK")!=-1) { return true; } } return false; } catch(Exception ex) { // You should implement more specific catch blocks so that you would know // what the problem was, ie port may be in use when you are trying // to test it so you should let the user know that as he can correct that fault return false; } finally { if(port!=null) { port.Close(); } } } public static string[] FindModems() { List&lt;string&gt; modems = new List&lt;string&gt;(); string[] ports = SerialPort.GetPortNames(); for(int i =0;i&lt;ports.Length;i++) { if(IsModem(ports[i])) { modems.Add(ports[i]); } } return modems.ToArray(); } </code></pre> <p>Something like this should work, I didn't test it ( can't test it ).</p>
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    1. POHow to get only User interface Com port from list of ports?
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    1. COThanx for reply SS 'Kain', can you please explain it how does it works or if any code sample then it is more expectable
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