public static void update(P_DanhSachPhapNhan obj)
 {
     using (var model= ModelConnector.Connector())
     {
         model.Entry(obj).State = System.Data.Entity.EntityState.Modified;
         model.SaveChanges();
     }
 }
 public static void save(P_DanhSachPhapNhan obj)
 {
     using(var model = ModelConnector.Connector())
     {
         model.P_DanhSachPhapNhan.Add(obj);
         model.SaveChanges();
     }
 }