How to edit 1000 records at time using entity framework in less time

public ActionResult EditRow()
{
        using (SchoolContext db = new SchoolContext())
        {
            var v = db.Students.ToList();
            return View(v);
        }
}

[HttpPost]
public ActionResult EditRow(List<Student> student)
{
        if (ModelState.IsValid)
        {
            using (SchoolContext db = new SchoolContext())
            {
                foreach (var i in student)
                {
                    var c = db.Students.Where(a => a.ID.Equals(i.ID)).FirstOrDefault();
                    if (c != null)
                    {
                        c.LastName = i.LastName;
                        c.FirstMidName = i.FirstMidName;
                        c.EnrollmentDate = i.EnrollmentDate;
                    }
                }
                db.SaveChanges();
                return RedirectToAction("Index");

            }
            ViewBag.Message = "Successfully updated";
            return View(student);

        }
        else
        {
            ViewBag.Message = "failed";
            return View(student);
}

Right now I have implemented this code,but server takes more time to edit records. Is there any way to edit records quickly? How can I minimise Execution time? and how to check time complexity in Visual studio?