how to save and update a record using the same view

Question

hello guys,am working on an online admission system where i store records of students in my database.
i have a form where i want to implement a save and update record in the same view insteasd of passing the values to another view for update..here is my code below

 if (ModelState.IsValid)

            {

                student = db.Students.Find(student.ID);

                if (student == null)

                {

                    db.Students.Add(student);

                }

                else

                {

                    db.Entry(student).State = EntityState.Modified;

                  

                }

                db.SaveChanges();