public AddSoil(string fk)
 {
     try
     {
         InitializeComponent();
         _viewmodel     = new AddSoilViewModel(Navigation, fk);
         BindingContext = _viewmodel;
     }
     catch (Exception e)
     {
         var myerror = e.Message; // error
                                  //  Log.Fatal(e);
     };
 }