public void loadnxb(int?selected = null)
        {
            var nxbs = NxbServeic.GetAll();

            ViewBag.id_nxb = new SelectList(nxbs, "id", "name", selected);
        }
 public void loadNxb()
 {
     cb_nhaxb.DataSource    = NxbServeic.GetAll();
     cb_nhaxb.ValueMember   = "id";
     cb_nhaxb.DisplayMember = "name";
 }