public FRM_PRODUCT()
        {
            InitializeComponent();

            // code to update for in aanother form
            if (frm == null)
            {
                frm = this;
            }


            this.dataGridView1.DataSource = prd.GET_ALL_PRODUCTS();
        }
        private void ادارةالمنتوجاتToolStripMenuItem_Click(object sender, EventArgs e)
        {
            FRM_PRODUCT frm = new FRM_PRODUCT();

            frm.ShowDialog();
        }
 static void frm_FormClosed(object sender, FormClosedEventArgs e)
 {
     frm = null;
 }