private void btnXoaHang_Click(object sender, EventArgs e)
{
frmXoaHang frmXH = new frmXoaHang();
frmXH.ShowDialog();
loadDuLieu();
}
private void btnXoaHang2_Click(object sender, EventArgs e)
{
Hang h = new Hang();
h.MaHang = dgvHang.SelectedRows[0].Cells[0].Value.ToString();
frmXoaHang formXoaHang = new frmXoaHang(h);
formXoaHang.ShowDialog();
loadDuLieu();
}