When I tried to execute the sample in Chapter 25, I could not do completely.

Being a beginner I could n't locate the errors.

Below are the errors I am getting from the following code.

A) ( QuoteServer/QuoteServer.cs )
-----------------------------------------------------------------
protected void ListenerThread()
{
try
{
IPAddress ipAddress = IPAddress.Parse("127.0.0.1");
listener = new TcpListener(ipAddress, port);
listener.Start();
while (true)
{
Socket clientSocket = listener.AcceptSocket();
string message = GetRandomQuoteOfTheDay();
UnicodeEncoding encoder = new UnicodeEncoding();
byte[] buffer = encoder.GetBytes(message);
clientSocket.Send(buffer, buffer.Length, 0);
clientSocket.Close();
}
}
---------------------------------------------------------------------
1) listener object returns NULL.
2) listener.AcceptSocket(); returns nothing being listener is NULL
----------------------------------------------------------------------
B) QuoteClient/MainWindow.xaml.cs
----------------------------------------------------------
protected void OnGetQuote(object sender, RoutedEventArgs e)
{
const int bufferSize = 1024;
Cursor currentCursor = this.Cursor;
this.Cursor = Cursors.Wait;
string serverName = Properties.Settings.Default.ServerName;
int port = Properties.Settings.Default.PortNumber;
var client = new TcpClient();
NetworkStream stream = null;
try
{
client.Connect(serverName, port);
stream = client.GetStream();
byte[] buffer = new byte[bufferSize];
int received = stream.Read(buffer, 0, bufferSize);
if (received <= 0)
{
return;
}
textQuote.Text = Encoding.Unicode.GetString(buffer).Trim('\0');
}
-------------------------------------------------------------
1) Client.Connect - doesn't connect any
2) Stream also NULL
3) received is 0
------------------------------------------------------------------
Not sure about the error.

Please let me know if any order I need to follow to execute this service.

For example , I need to run the service, run the service and client etc.

Details about Local host, port number etc.

Try to suggest how to run the whole program.

Thanks
Srikanth V

How did you verify that listener is null?
If listener would be null, calling AcceptSocket() would throw a NullReferenceException.
What do you mean with AcceptSocket() returns nothing? Do you mean this method blocks and the program stays there? This should be the case until a client connects.

What happen's with "doesn't connect any"? Did you change the server name to your machine?
If the stream is null, stream.Read() would throw a NullReferenceException, and not assign a 0 value to received.

Can you please supply more information on the errors you see?

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the Port and the ServerName is null? you may confirm the setting proper and check it work,the client and customer will use the same port and ServerName .I think you problem will it cause