private void cboNCC_SelectedIndexChanged(object sender, EventArgs e)
{
NhaCungCap ma = (NhaCungCap)ncc.timMaNCC(cboNCC.SelectedValue.ToString());
if (ma != null)
{
txtTen.Text = ma.TenNhaCungCap.ToString();
txtDiaChi.Text = ma.DiaChi.ToString();
txtSDT.Text = ma.SoDienThoai.ToString();
}
//string ml = cboNCC.SelectedValue.ToString();
//if (ml != null)
// gvNCC.DataSource = ncc.getNhaCungCap_ByMaNCC(ml);
}