Detecting loss of network

[John J. Hughes II]

I am using the following code to monitor a socket port. The code normally
works fine unless a network connection is lost. Since both ends of the
conversation on the same computer (normally) this causes a problem because
they can no longer connect. On my system if the network is reconnected the
two system can start communicating again but on other systems I am told they
can not.

One program is a service and the other is the user interface which is why I
am doing this.

So the questions:

1) Is there a way of handling this so a loss of the network connection does
not drop the connect when both programs are on the same system?

2) Is there anyway for the listener to determine that the network connect
has been lost?

3) In the latest version of .NET have them implemented memory pipes yet?

Regards,
John
CODE:

IPHostEntry ipHostInfo = Dns.GetHostEntr y(Dns.GetHostNa me());
foreach(IPAddre ss ipAddress in ipHostInfo.Addr essList)
{
try
{
int ConnectionPort = (int)Utils.Misc Funs.ReadRegDat a(false, "Socket",
"Monitor Port", 12000);
int MaxThrds = (int)Utils.Misc Funs.ReadRegDat a(false, "Socket", "Max
Threads", 5);

IPEndPoint localEndPoint = new IPEndPoint(ipAd dress, ConnectionPort) ;
if (localEndPoint. AddressFamily == AddressFamily.I nterNetwork)
{
Socket listener = new Socket(AddressF amily.InterNetw ork,
SocketType.Stre am, ProtocolType.Tc p);
listener.Bind(l ocalEndPoint);
listener.Listen (MaxThrds);
this.ListenerLi st.Add(listener );
}
}
catch(System.Th reading.ThreadA bortException abEx)
{
throw abEx;
}
catch(Exception ex)
{
this.onExceptio n(ex);
System.Diagnost ics.Debug.Write Line("Monitor Thread (IPAddress)" +
ex.Message);
}
}
while(this.IsRu n)
{
try
{
ArrayList tmpPortList = new ArrayList();
foreach(object o in this.ListenerLi st)
tmpPortList.Add (o);

if(tmpPortList. Count > 0)
{
Socket.Select(t mpPortList, null, null, 1000);
foreach(object o in tmpPortList)
{
Socket s = ((Socket)o).Acc ept();
/// start thread to do something
}
}
}
catch(System.Th reading.ThreadA bortException abEx)
{
throw abEx;
}
catch(Exception ex)
{
this.onExceptio n(ex);
System.Diagnost ics.Debug.Write Line("Monitor Thread (IPAddress2)" +
ex.Message);
}
}