private void TextBlock_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
        {
            TextBlock  block = sender as TextBlock;
            string     text  = block.Text;
            ClientInfo info  = new ClientInfo(text);

            m_sendclient.StartSend(socket, info.endpoint);
            socket.SendTo(Encoding.Default.GetBytes("#MSG#" + info.info), endpoint);
        }