private async System.Threading.Tasks.Task GotoMenu()
        {
            AreBtnsEn = false;
            User user = new User(Entry_Email, Entry_Password);

            userToken = await n_Restctrl.GetToken(user);

            Constants.userToken = userToken;
            if (userToken != null)
            {
                await Application.Current.MainPage.DisplayAlert("Login", "Login succesfull", "Ok");

                Application.Current.MainPage = new NavigationPage(new MenuListsView());
            }

            else
            {
                await Application.Current.MainPage.DisplayAlert("Login", "Login failed", "Ok");
            }
            AreBtnsEn = true;
        }