public ListScreen()
        {
            this.InitializeComponent();
            
            this.dbHelper = new DatabaseHelper();
            ObservableCollection<Encryption> encryptions =  dbHelper.GetEncryptions();

            this.lv_crypt.DataContext = encryptions;

            if (encryptions.Count == 0)
            {
                this.tb_empyList.Text = "No value to display";
            }
            else
            {
                this.tb_empyList.Text = "";
            }
        }