private void tìmKiếmĐoànViênToolStripMenuItem_Click(object sender, EventArgs e)
        {
            frmTimkiemdv tkdv = new frmTimkiemdv();

            tkdv.Show();
        }
        private void buttonItem3_Click(object sender, EventArgs e)
        {
            frmTimkiemdv tkdv = new frmTimkiemdv();

            tkdv.Show();
        }