Same action with both GET and POST

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C#

ASP.NET

Visual-Studio

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I'm learning ASP.NET MVC 5 framework and web development.
t’s not clear to me how can I use the same action of a controller (e.g. Edit) to accomplish two different tasks by keeping track of the input parameter (let's say the parameter is the ID of an item) :
action1: insert info about the item (GET)
action 2: edit info about that item (POST).

Can I use a RedirectToAction and pass the second “edit action” (EditConfirmed) together with the parameter which I passed in the first one?


Or there is no need to do that and I just implement two "Edit" actions, the first one with GET and the second one with POST, by passing a different num of parameters?

In that case, can you explain to me how the framework works, i.e.: I call the View(itemModel) in the first Edit action Edit(itemId) and I'm redirected to the "Edit" View.
Now I have to insert the info about the item With Newvalues and I use the second Edit action with the Post method , Edit(id, itemWithNewvalues).
How does the framework know that the id to pass to this second action is the same I passed to the first one, without using a RedirectToAction?

What I have tried:

1) I tried it by using RedirectToAction :

// GET:       
        public ActionResult Edit(int id)
        {          
            var returnedMovie = _movieProxy.GetMovieById(id);

            // if not found
            if (returnedMovie == null)
                return HttpNotFound();
            
            RedirectToAction("EditConfirmed", "MovieMvc", id);
        }



        // POST:     
        [HttpPost]       
        public ActionResult EditConfirmed(int movieId, Movie movieWithNewValues)
        {
            try
            {               
                _bookProxy.UpdateMovie(movieId, movieWithNewValues);

                return RedirectToAction("Index");
            }
            catch
            {                
                return RedirectToAction("Index");
            }
        }

2) I tried it without using RedirectToAction :

// GET:       
        public ActionResult Edit(int id)
        {          
            var returnedMovie = _movieProxy.GetMovieById(id);

            // if not found
            if (returnedMovie == null)
                return HttpNotFound();
            
            return View(returnedMovie);
        }



        // POST:     
        [HttpPost]       
        public ActionResult EditConfirmed(int movieId, Movie movieWithNewValues)
        {
            try
            {               
                _movieProxy.UpdateMovie(movieId, movieWithNewValues);

                return RedirectToAction("Index");
            }
            catch
            {                
                return RedirectToAction("Index");
            }
        }

Which of the previous approaches is correct?