private void btnNhanVien_Click(object sender, EventArgs e)
{
this.button_save.PerformClick();
FormNhanVien nv = new FormNhanVien(change);
nv.FormClosed += new FormClosedEventHandler(NhanVien_FormClose);
nv.Show();
this.Hide();
}
public SignUp(FormNhanVien parent)
{
this.parent = parent;
InitializeComponent();
}