Best practice for redirecting to Umbraco page?

Questions
1

I have an ActionResult method where I query a database for products and if none are found, I redirect the user to the page /products/noproductsfound.

noproductsfound currently exists as a node in my backoffice and it has the Id of 1093. Currently, I am just doing:

return RedirectToUmbracoPage(1093);

What happens if:

  1. The page (node) is deleted?
  2. What is the best way to store the node id to be used in RedirectToUmbracoPage? AppSettings?, etc
  3. Is this the proper way to redirect to another page? Why isn’t there an option to redirect with the name of a page instead?
  4. I tried doing return View("NoProductsFound"), but this is done after a post, so the view gets rendered, but stays on the same page, so a refresh keeps posting data.
  5. If page nodes can be stored in AppSettings and the page is deleted and recreated assuming with a different Id, a non-technical person is not going to want to update AppSettings with the new Id, so how is this handled?
This is a companion discussion topic for the original entry at https://our.umbraco.com/forum/71344-best-practice-for-redirecting-to-umbraco-page