private void notification_add_Load(object sender, EventArgs e)
        {
            LinkedList <server> serverList = new LinkedList <server>();

            serverList = dataOperator.getAllServers();
            foreach (server s in serverList)
            {
                cbServers.Items.Add(s.getName() + " " + s.getMAC());
            }
        }
        private void showAllServers()
        {
            dgServers.Rows.Clear();
            LinkedList <server> serversList = new LinkedList <server>();

            serversList = dataOperator.getAllServers();

            if (serversList != null)
            {
                foreach (server s in serversList)
                {
                    dgServers.Rows.Add(s.getMAC(), s.getName(), s.getDescription());
                }
            }
            else
            {
                Form1.showErrorMessage("No server found in database");
            }
        }