private void dgvHoaDon_CellClick(object sender, DataGridViewCellEventArgs e)
{
if (e.RowIndex > -1)
{
donNhapHangBLL = new DonNhapHangBLL();
string maHD = dgvHoaDon.Rows[e.RowIndex].Cells[0].Value.ToString();
donNhapHang = donNhapHangBLL.GetDonNhapHangByID(maHD);
txtMaHD.Text = donNhapHang.MaDNH;
txtNgayLap.Text = donNhapHang.NgayLap.ToString();
txtConNo.Text = donNhapHang.ConLai.ToString();
txtTongTien.Text = donNhapHang.TongTien.ToString();
}
}