public bool Insert(staff nv)
        {
            try
            {
                db.staffs.InsertOnSubmit(nv);

                var permissions = from p in db.permissions
                                  select p;
                foreach (permission p in permissions)
                {
                    staff_permission sp = new staff_permission();
                    sp.permission = p;
                    sp.staff      = nv;
                    sp.created    = DateTime.Now;
                    sp.allow      = false;

                    db.staff_permissions.InsertOnSubmit(sp);
                }

                db.SubmitChanges();
                return(true);
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
 public bool Delete(staff nv)
 {
     try
     {
         staff_permission p = db.staff_permissions.Where(t => t.staff_id.Equals(nv.id)).FirstOrDefault();
         if (p != null)
         {
             return(false);
         }
         return(true);
     }
     catch (Exception ex)
     {
         throw ex;
     }
 }