public void KiemTra_Quyen()
{
txtTaiKhoan.DataBindings.Clear();
txtTaiKhoan.DataBindings.Add("Text", dtgDangNhap.DataSource, "TaiKhoan");
txtQuanLy.DataBindings.Clear();
txtQuanLy.DataBindings.Add("Text", xldl.QuanLy_PQ(dl), "QuanLy");
txtBanHang.DataBindings.Clear();
txtBanHang.DataBindings.Add("Text", xldl.BanHang_PQ(dl), "BanHang");
txtKho.DataBindings.Clear();
txtKho.DataBindings.Add("Text", xldl.Kho_PQ(dl), "Kho");
txtTongKet.DataBindings.Clear();
txtTongKet.DataBindings.Add("Text", xldl.TongKet_PQ(dl), "TongKet");
}