public ActionResult Index(string id) { Session["CurrentOffice"] = null; Session.Remove("CurrentOffice"); if (id == null) { if (Session["officeDivision"] == null) { Session["officeDivision"] = "Barishal"; } } else { Session["officeDivision"] = id; } return(View(officeService.GetAllForOffice(Session["officeDivision"].ToString()))); }