public void UpdateEnt<T>(T entity) where T : parent_table
    {
        if (entity == null)
        {
            throw new ArgumentException("Cannot add a null entity.");
        }
        using (var _context = (DataModelDetach)d.GetContextForRead(Module))
        {
            var entry = _context.Entry<T>(entity);

            if (entry.State == EntityState.Detached)
            {
                var set = _context.Set<T>();
               T attachedEntity = set.Include(x => x.children_1).Include(x => x.children_2).SingleOrDefault(e => e.idSeq == entity.idSeq);


                if (attachedEntity != null)
                {
                    var attachedEntry = _context.Entry(attachedEntity);
                    attachedEntry.CurrentValues.SetValues(entity);
                }
                else
                {
                    entry.State = EntityState.Modified; // This should attach entity
                }



            }

        }
    }