private void txtTimKiem_TextChanged(object sender, TextChangedEventArgs e) { DataTable dataTable = new DataTable(); if (txtTimKiem.Text.Length >= 1 && txtTimKiem.Text != "Tìm Kiếm...") { switch (type_timkiem) { case 0: { dataTable = NguoiDungBUS.TimTheoMaND(txtTimKiem.Text.ToString()); } break; case 1: { dataTable = NguoiDungBUS.TimTheoHoTenNguoiDung(txtTimKiem.Text.ToString()); } break; } } else if (txtTimKiem.Text.Length == 0) { dataTable = NguoiDungBUS.LoadDSND(); } Load_Data(dataTable); }