private void DgvDonhang_CellContentClick(object sender, DataGridViewCellEventArgs e)
{
txtMadh.Text = dgvDonhang.CurrentRow.Cells[0].Value.ToString();
txtTenKH.Text = db.getTenKH(Convert.ToInt32(dgvDonhang.CurrentRow.Cells[1].Value.ToString()));
txtPhi.Text = dgvDonhang.CurrentRow.Cells[2].Value.ToString();
txtNgaydat.Text = dgvDonhang.CurrentRow.Cells[4].Value.ToString();
cbbTinhtrang.Text = dgvDonhang.CurrentRow.Cells[3].Value.ToString();
}
