Question

i am trying to disconnect a client from a server but the server still sees it as being connected. I cant find a solution to this and Shutdown, Disconnect and Close all dont work.

Some code for my disconnect from the client and checking on the server:

Client:

  private void btnDisconnect_Click(object sender, EventArgs e)
    {
        connTemp.Client.Shutdown(SocketShutdown.Both);
        connTemp.Client.Disconnect(false);
        connTemp.GetStream().Close();
        connTemp.Close();
    }

Server:

    while (client != null && client.Connected)
            {
                NetworkStream stream = client.GetStream();
                data = null;

                try
                {
                    if (stream.DataAvailable)
                    {
                        data = ReadStringFromClient(client, stream);
                        WriteToConsole("Received Command: " + data);
                    }
                } // So on and so on...

There are more writes and reads further down in the code.

Hope you all can help.

UPDATE: I even tried passing the TCP client by ref, assuming there was a scope issue and client.Connected remains true even after a read. What is going wrong?

Second Update!!:

Here is the solution. Do a peek and based on that, determine if you are connected or not.

  if (client.Client.Poll(0, SelectMode.SelectRead))
                    {
                        byte[] checkConn = new byte[1];
                        if (client.Client.Receive(checkConn, SocketFlags.Peek) == 0)
                        {
                            throw new IOException();
                        }
                    }

Answer 1

Here is the solution!!

  if (client.Client.Poll(0, SelectMode.SelectRead))
                {
                    byte[] checkConn = new byte[1];
                    if (client.Client.Receive(checkConn, SocketFlags.Peek) == 0)
                    {
                        throw new IOException();
                    }
                }