public Dictionary <int, string> ThanhPhamS()
        {
            Dictionary <int, string> dict = new Dictionary <int, string>();

            foreach (EpKim ek in EpKim.DocTatCa())
            {
                dict.Add(ek.ID, ek.Ten);
            }
            return(dict);
        }
 public List <EpKim> ThanhPhamS()
 {
     return(EpKim.DocTatCa());
 }
 public List <EpKim> EpKimS()
 {
     return(EpKim.DocTatCa());
 }