private void manageToolStripMenuItem_Click(object sender, EventArgs e)
        {
            Manage_Item_details mitdl = new Manage_Item_details();

            mitdl.ShowDialog();
        }
        private void button2_Click(object sender, EventArgs e)
        {
            Manage_Item_details mitdl = new Manage_Item_details();

            mitdl.ShowDialog();
        }