public IEnumerable <string> getListNXBstring()
{
IEnumerable <NhaXuatBan> listNXB = BaiDangSUM.getlistNXB();
List <string> listNXBstring = new List <string>();
foreach (NhaXuatBan tg in listNXB)
{
listNXBstring.Add(tg.tennhaxuatban);
}
return(listNXBstring.AsEnumerable());
}
public IEnumerable <NhaXuatBan> getListNXB()
{
IEnumerable <NhaXuatBan> listTG = BaiDangSUM.getlistNXB();
return(listTG);
}