private void EditItemClick(object sender, RoutedEventArgs e)
        {
            string ricerca = listBoxServers.SelectedItem.ToString();

            foreach (Server s in serverList)
            {
                if (s.name == ricerca)
                {
                    s.name      = TextBox_AddName.Text;
                    s.ipAddress = TextBox_AddIp.Text;
                    s.port      = TextBox_AddPort.Text;
                    s.password  = TextBox_AddPassword.Password;
                    break;
                }
            }

            listBoxServers.Items.Clear();
            foreach (Server s in serverList)
            {
                listBoxServers.Items.Add(s.name);
            }
            TextBox_AddName.Clear();
            TextBox_AddIp.Clear();
            TextBox_AddPassword.Clear();
            TextBox_AddPort.Clear();
        }
        private void AddItemClick(object sender, RoutedEventArgs e)
        {
            String serverName = TextBox_AddName.Text;
            String ipAddress  = TextBox_AddIp.Text;
            String password   = TextBox_AddPassword.Password;
            String port       = TextBox_AddPort.Text;

            if (!string.IsNullOrWhiteSpace(serverName) && !string.IsNullOrWhiteSpace(ipAddress) &&
                !string.IsNullOrWhiteSpace(password) && !string.IsNullOrWhiteSpace(port))
            {
                Server s = new Server();

                s.name      = serverName;
                s.ipAddress = ipAddress;
                s.password  = password;
                s.port      = port;

                serverList.Add(s);
                listBoxServers.Items.Add(TextBox_AddName.Text);
                TextBox_AddName.Clear();
                TextBox_AddIp.Clear();
                TextBox_AddPassword.Clear();
                TextBox_AddPort.Clear();
            }
            else
            {
                MessageBox.Show("Fill all fields", "Error", MessageBoxButton.OK, MessageBoxImage.Warning);
            }
        }