public List <DUONGDAI_KHACHHEN> DieuxeTimKiem(DateTime?dt, string dienthoai, string diachi, string tenkhachhang) { using (var db = new DUONGDAI_KHACHHEN_DA()) { return(db.DieuxeTimKiem(dt, dienthoai, diachi, tenkhachhang).ToList <DUONGDAI_KHACHHEN>()); } }