How to speed this up

void ScanForServer()
    {
    IPEndPoint ReceiveIP = null;
    UdpClient listener = null;
    Byte[] RequestData = null;
    byte[] BytesReceived = null;
    int UDPPort = 3483;
    Stopwatch s1 = new Stopwatch();
    Stopwatch s2 = new Stopwatch();
    Stopwatch s3 = new Stopwatch();
    Stopwatch s4 = new Stopwatch();
    Stopwatch s5 = new Stopwatch();
    Stopwatch s6 = new Stopwatch();
    try
        {
        s1.Start();
        ReceiveIP = new IPEndPoint(IPAddress.Any, UDPPort);
        s1.Stop();
        s2.Start();
        listener = new UdpClient(this.UDPPort);
        s2.Stop();
        s3.Start();
        // RequestData will contain a server request in the correct format
        // ReceivIP will contain the ip address of a discovered server.
        RequestData = listener.Receive(ref ReceiveIP);
        s3.Stop();
        s4.Start();
        // Which I then send back as a request
        listener.Send(RequestData, RequestData.Length, ReceiveIP);
        s4.Stop();
        s5.Start();
        // This will return server information such as the tcp port.
        BytesReceived = listener.Receive(ref ReceiveIP);
        s5.Stop();
        }
    catch (Exception ex)
        {
        MessageBox.Show(ex.Message);
        }
    finally
        {
        s6.Start();
        if (listener != null && listener.Client.Connected)
            listener.Close();
        s6.Stop();
        }
    Console.WriteLine("{0}:{1}:{2}:{3}:{4}:{5}",
                        s1.ElapsedMilliseconds,
                        s2.ElapsedMilliseconds,
                        s3.ElapsedMilliseconds,
                        s4.ElapsedMilliseconds,
                        s5.ElapsedMilliseconds,
                        s6.ElapsedMilliseconds);
    }