private void stockRecordToolStripMenuItem_Click(object sender, EventArgs e)
        {
            //change page by clicking the item Fill in the page name
            StockRecord sr = new StockRecord();

            sr.Show();
        }
        private void stockRecordToolStripMenuItem_Click_1(object sender, EventArgs e)
        {
            this.Hide();
            StockRecord sr = new StockRecord();

            sr.Show();
        }