private void link_doimatkhau_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
{
DoiMatKhau frm = new DoiMatKhau();
frm.Show();
this.Hide();
}
private void đổiMậtKhẩuToolStripMenuItem_Click(object sender, EventArgs e)
{
DoiMatKhau frm = new DoiMatKhau();
frm.Show();
this.Hide();
}