private void btnAddCustomer_Click(object sender, EventArgs e)
        {
            Hide();
            FormMenu frmMenu = new FormMenu(-1, -1, -1);

            frmMenu.ShowDialog();
        }
        private void SelectItems(int customerId, int addressId)
        {
            Hide();
            FormMenu frm = new FormMenu(customerId, addressId, -1);

            frm.ShowDialog();
        }
 private void btnModifyOrder_Click(object sender, EventArgs e)
 {
     try
     {
         Hide();
         FormMenu frm = new FormMenu(Convert.ToInt32(lblCustomerId.Text), Convert.ToInt32(lblAddressId.Text), Convert.ToInt32(lblOrderID.Text));
         frm.ShowDialog();
     }
     catch (Exception ex)
     {
         MessageBox.Show(ex.Message);
     }
 }