public async Task <ActionResult> Cart(string isbns = null)
{
if (isbns == null)
{
return(View("CartNoModel"));
}
else
{
var model = await _facade.GetBookCatalogItemModelsByIsbns(isbns.Split(','));
return(View("CartWithModel", model));
}
// return View(isbns == null ? "CartNoModel" : "CartWithModel");
}
