private void btn_KM_Click(object sender, EventArgs e)
{
SetKhuyenMai setKhuyenMai = new SetKhuyenMai();
this.Hide();
setKhuyenMai.Show();
}
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
QuanLyKho kho = new QuanLyKho();
DangNhap dangNhap = new DangNhap();
TuyChon tuyChon = new TuyChon();
SetKhuyenMai km = new SetKhuyenMai();
ThongKeDoanhSo thongke = new ThongKeDoanhSo();
Order order = new Order();
Application.Run(dangNhap);
}