private void frmKhachHang_Load(object sender, EventArgs e)
{
DangNhap_DAL dn = new DangNhap_DAL();
if (dn.MaNhomPer(DangNhap_DAL.UserName))
{
pnControl.Enabled = true;
}
else
{
pnControl.Enabled = false;
}
dataGridViewKH.DataSource = kh.LoadDLKhachHang();
}