TCPListener - Stay Connected or Connect-on-Demand?

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C#

.NET

hardware

Hi Guys,
I have a question regarding TCP Listeners and Clients that probably doesn't have one answer but i thought i would post it anyway to see what people think.

Project Description:
I have recently started playing around with the Arduino Hardware, in particular the Ethernet Sheild. I was thinking about making an IP Temperature Sensor that would connect to a PC running a TCP Listener and send a data string containing the current temperature every minute.

Question:
Is it better to keep a TCP connection to a server permantly alive or connect to the TCP Listener, send the command and then terminate the connection every time i wish to communicate something?


Code:
The Code below seems to be able to connect and communicate with the arduino.

try
{
    /// Local IP Address.
    IPAddress ip = IPAddress.Parse("127.0.0.1");
    /// Initializes the Listener.
    TcpListener myListener = new TcpListener(ip, 8001);
    /// Start Listeneting at the specified port.
    myListener.Start();
    listbox1.Items.Add("The Listener is running on " + myListener.LocalEndpoint);
    listbox1.Items.Add("Waiting for a connection...");
    Socket mySocket = myListener.AcceptSocket();
    listbox1.Items.Add("Connection accepted from " + mySocket.RemoteEndPoint);

    /// Receives Message From Client.
    byte[] rData = new byte[100];
    int k = mySocket.Receive(rData);
    listbox1.Items.Add("Recieved...");
    for (int i = 0; i < k; i++)
        listbox1.Items.Add(Convert.ToChar(rData[i]));
    ASCIIEncoding tData = new ASCIIEncoding();
    mySocket.Send(tData.GetBytes("response"));
    listbox1.Items.Add("\nSent Response");

    /// Close Connection.
    mySocket.Close();
    myListener.Stop();
}

catch
{
    listbox1.Items.Add("You broke something...");
}

More Information:
On the Arduino side of things i am just using the default "Web Client" example that comes with the arduino-0018 software and changed the IP address and port.

Thanks in advance,
Alex.