public ActionResult Products(int catid)
{
NorthwindDb db = new NorthwindDb(connectionString);
Category category = db.GetCategoryById(catid);
IEnumerable <Product> products = db.GetProductsForCategory(catid);
ProductsViewModel viewModel = new ProductsViewModel();
viewModel.Products = products;
viewModel.Category = category;
return(View(viewModel));
}