private void toolStripBtnXuatKho_Click(object sender, EventArgs e)
        {
            Form_PhieuXuat f = new Form_PhieuXuat("NV01");

            this.Hide();
            f.ShowDialog();
            this.Show();
        }
        private void button5_Click(object sender, EventArgs e)
        {
            Form_PhieuXuat form = new Form_PhieuXuat("NV010");

            this.Hide();
            form.ShowDialog();
            this.Show();
        }