private void Btn_Search_Clicked(object sender, EventArgs e)
   {
            var container = BindingContext as ToolViewModel;
            var searchValueToolDescription = SfEntry_ToolType.Text;
            var searchValueToolLocation = SfEntry_ToolLocation.Text;
            var searchValueToolPrice = SfEntry_ToolPrice.Text;

            listTools.BeginRefresh();

            listTools.ItemsSource = container.Tools.Where(i =>
            i.ToolDescription.Contains(searchValueToolDescription) &&
            i.ToolLocation.Contains(searchValueToolLocation));

        }