private void txtTimKiem_KeyUp(object sender, KeyEventArgs e)
{
Class.XuLyThuVien KiemTra = new Class.XuLyThuVien();
if (txtTimKiem.Text == " " || txtTimKiem.Text == " ")
{
}
else
{
GridViewTraCuuSach.DataSource = KiemTra.TraCuuSach(txtTimKiem.Text);
if (GridViewTraCuuSach.DataSource == null || txtTimKiem.Text == null)
{
GridViewTraCuuSach.Rows.Clear();
GridViewTraCuuSach.Refresh();
}
}
}