TCP to XElement

Can you show what you receive? You may have to use string manipulation.

Remember that your TCP stream is sending bytes, not XML. The bytes may very well (collectively) represent an XML document, but so far as the TcpClient is concerned, it's just a stream of bytes.

How are you attempting to load the byte stream into the XElement?

Yes but I've got the data as string, so when I look at the value of the data received then I can see the xml document.  
But I've since found there is something at the end of the string - invisible characters...a CR or something

hmmm just checked the length and it reports it as 10024 even though there are only 243 characters and the error message says 244 is amiss.

How are you reading from the TCP stream? You may be reading improperly, and the end of your buffer contains data from the previous read.

Here's the whole code, it can't be data from previous read because I'm restarting every time.

        Dim PORT As Integer = 50000
        Dim serverSocket As New TcpListener(IPAddress.Any, PORT)

        Dim requestCount As Integer
        Dim clientSocket As TcpClient
        serverSocket.Start()

        clientSocket = serverSocket.AcceptTcpClient()

        requestCount = 0

        While (True)
            Try
                requestCount = requestCount + 1
                Dim networkStream As NetworkStream = clientSocket.GetStream()
                Dim bytesFrom(10024) As Byte
                networkStream.Read(bytesFrom, 0, CInt(clientSocket.ReceiveBufferSize))
                networkStream.Flush()
                Dim dataFromClient As String = System.Text.Encoding.ASCII.GetString(bytesFrom)

                updategrid(dataFromClient)

            Catch ex As Exception
                MsgBox(ex.ToString)
            End Try
        End While

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Ohh I realise now, I'm setting bytesFrom as 10024 bytes, thats why its giving me the length it is and getting the error.
I dunno how to fix this.

I've changed it slightly to

                Dim ReceivedBytes(1024) As Byte
                Dim BytesReceived As Integer
                Dim ReceivedText As String

                BytesReceived = networkStream.Read(ReceivedBytes, 0, ReceivedBytes.Length)
                ReceivedText = Encoding.ASCII.GetString(ReceivedBytes, 0, BytesReceiv

and now I get the real string without the superfluous space.

I think I've got it now...

                BytesReceived = networkStream.Read(ReceivedBytes, 0, ReceivedBytes.Length)
                ReceivedText = Encoding.UTF8.GetString(ReceivedBytes, 0, BytesReceived)

                Dim doc As XElement = XElement.Parse(ReceivedText)

The listener.AcceptTcpClient (or listener.AcceptSocket, if that's what you are using) should be placed within the loop.

Solved myself