public ActionResult Edit(t_staff_holiday staffholidays)
 {
     if (ModelState.IsValid)
     {
         projManager.Entry(staffholidays).State = EntityState.Modified;
         projManager.SaveChanges();
         return RedirectToAction("Index");
     }
     return View(staffholidays);
 }
        public ActionResult Create(t_staff_holiday staffholidays)
        {
            if (ModelState.IsValid)
            {
                projManager.StaffHolidays.Add(staffholidays);
                projManager.SaveChanges();
                return RedirectToAction("Index");
            }

            return View(staffholidays);
        }