private void button4_Click(object sender, EventArgs e)
        {
            try
            {
                //اضافة معلومات الفتورة
                order.ADD_ORDERS(Convert.ToInt32(text_order_id.Text), dt_order.Value, text_order_des.Text, Convert.ToInt32(text_cust_id.Text), text_sales_man.Text);

                //اضافة المنتوجات المدخلة
                for (int i = 0; i < DGV_PRD_BILL.Rows.Count - 1; i++)
                {
                    order.ADD_ORDERS_DETAILS(DGV_PRD_BILL.Rows[i].Cells[0].Value.ToString(), Convert.ToInt32(text_order_id.Text)
                                             , DGV_PRD_BILL.Rows[i].Cells[1].Value.ToString(), DGV_PRD_BILL.Rows[i].Cells[2].Value.ToString()
                                             , Convert.ToInt32(DGV_PRD_BILL.CurrentRow.Cells[3].Value), Convert.ToInt32(DGV_PRD_BILL.Rows[i].Cells[5].Value)
                                             , DGV_PRD_BILL.Rows[i].Cells[4].Value.ToString(), DGV_PRD_BILL.Rows[i].Cells[6].Value.ToString());
                }

                MessageBox.Show("Saved Successfully", "Save Operation", MessageBoxButtons.OK, MessageBoxIcon.Information);

                if (MessageBox.Show("Do you want to Print this Order?", "Inquiry Process", MessageBoxButtons.YesNo, MessageBoxIcon.Exclamation) == DialogResult.Yes)
                {
                    button_print.Enabled = true;
                    butto_add.Enabled    = false;
                    //MessageBox.Show("Successfully Print", "Inquiry Process", MessageBoxButtons.OK, MessageBoxIcon.Information);
                }
                else
                {
                    MessageBox.Show("Print Canceled", "Print Process", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
                    button_new.Enabled = true;
                }

                // ClearData();
            }
            catch
            { return; }
        }