string readData = null;

    public void getMessage()
    {
        while (true)
        {
            serverStream = clientSocket.GetStream();
            int buffsize = 0;
            byte[] inStream = new byte[10025];
            buffsize = clientSocket.ReceiveBufferSize;
            serverStream.Read(inStream, 0, buffsize);
            string rData = Encoding.ASCII.GetString(inStream);
            readData = "" + rData;
            //MessageBox.Show(rData);

            switch (readData)
            {
                case ("Overview"):
                    MessageBox.Show("Start");
                    break;
                default:
                    break;
            }
        }
    }