Detecting Disconnected Sockets

[Ganwold]

I have a created a multi-threaded TcpClient server that works for my needs. Each thread uses synchronous (blocked) communication to wait for a command from the client

Here's the problem...if a client does not gracefully disconnect (unplug the device from the network or a power failure), my server does not recognize the lost connection and just continues to wait to receive data.

Any help would be great, I have been searching online for a few days now and I know I'm doing everything correctly except this problem.

Thank you in advance.

Here is a new Thread of the server that to receives the data:

class ConnectionThrea d
{
public TcpListener threadListener;
private static int connections = 0;

public event textParserEvent Handler incomingText;

public void HandleConnectio n()
{
int recv;
byte[] data = new byte[1024];
string foundText = null;
string[] textList = null;
TcpClient client = threadListener. AcceptTcpClient ();
NetworkStream ns = client.GetStrea m();

textParserEvent Args e = new textParserEvent Args(ns);
while (true)
{
try
{
data.Initialize ();
//*** Waits on next line for data, returns 0 if graceful disconnect ***///
recv = ns.Read(data, 0, data.Length);
if (recv == 0)
break;
foundText = Encoding.ASCII. GetString(data, 0, recv);
textList = foundText.Split (' ');
e.foundText = textList;
incomingText(th is, e);
}
catch (System.IO.IOEx ception f)
{
Console.WriteLi ne("Data Read Error: " + f.Message);
}
}
ns.WriteTimeout = 1;
client.LingerSt ate.Enabled = false;
ns.Close();
client.Close();

connections--;
Console.WriteLi ne("Client disconnected: {0} active connections", connections);
Thread.CurrentT hread.Abort();
}
}