How do I redirect from a page in one folder to a page in another folder with core 2.2 razor pages?

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C#

Razor

Just starting out with a Razor page application using Core 2.2. An Edit page in one folder (Projects/Edit/x) includes a table of Searchfields. The Searchfield table has an edit link to /Searchfields/Edit/x folder in the cshtml file. The link works fine to get to the Searchfields Edit page. A link on the Searchfield/Edit cshtml page back to the Projects/Edit page (Back to Projects) also works fine. The problem is in the OnPostAsync task I want to save changes and return to the Projects/Edit page. The code is:

public async Task<iactionresult> OnPostAsync()
{
   if (!ModelState.IsValid)
   {
      return Page();
   }

   _context.Attach(SearchField).State = EntityState.Modified;

   try
   {
      await _context.SaveChangesAsync();
   }
   
   catch (DbUpdateConcurrencyException)
   {
      if (!SearchFieldExists(SearchField.Id))
      {
         return NotFound();
      }
      else
      {
         throw;
      }
   }

   return RedirectToPage("/Projects/Edit/3");
}

What I have tried:

I have tried RedirectToPage, RedirecToRoute, as well as other variation of RedirectToRoute. By the way, the SaveChangesAsync works without error.

I get exception No page named '/Projects/Edit/3' matches the supplied values. Yet the link on the cshtml page is the same, and works fine. Thanks for any help you can provide.

I have worked through several Microsoft tutorials, but they seem to always return to a page within the same folder. Thanks for any help you can provide.