public JsonResult GetAllUsers() { IEnumerable <IUser> temp = null; IDatabaseAdapter adapter = DatabaseAdapter.Instance(); //adapter = (DatabaseAdapter)adapter; try { temp = adapter.GetAllUsers(); } catch (System.Exception e) { throw new System.ArgumentException("Error in getAllUsers() request Nadina" + e); } try { return(Json(temp.ToList(), JsonRequestBehavior.AllowGet)); } catch (System.Exception e) { throw new System.ArgumentException("Error in JSon request" + e); } }