private void button2_Click(object sender, EventArgs e)
{
QuanLyController quanLy = new QuanLyController();
XemAllThongKe allThongKe = new XemAllThongKe(quanLy.ThongTinTD(dateTimePicker1.Value));
allThongKe.FThongTinTieuDung();
allThongKe.Show();
}