How do I make a comment to return to its own id after making a reply

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ASP.NET

MVC4

Please Guys How do I make a comment to return me to the Id of the comment made. If i make a comment, it takes me back to the Id of the Post.

Meaning that if a topic has 10 pages and i make a comment, instead of it taking me to the last page where the comment Id is, it takes me back to page 1 where the Post Id is.

How do i fix this???

This is what i have:

var myquote = new ModQuote
                {
                    UserId = WebSecurity.GetUserId(user),
                    PostId = model.PostId,
                    Comment = model.Comment,
                    ReplyId = model.ReplyId,
                    ProfileId = model.ProfileId,
                    By = User.Identity.Name,
                    File = model.File
                };
                //var last = db.MyModQuote.Where(a => a.PostId == id).AsEnumerable().LastOrDefault();
                //if (last != null)
                //{
                //    var find = db.Posts.Find(last.PostId);
                //}
                
                db.MyModQuote.Add(myquote);
                db.SaveChanges();
                return RedirectToAction("topics", new { id = id });
            }


            return View(model);

What I have tried:

I have tried this:

db.MyModQuote.Add(myquote);
db.SaveChanges();
return RedirectToAction("topics", new { id = commentId});
}