private void addProductToolStripMenuItem_Click(object sender, EventArgs e)
        {
            subMenu = MenuItems.AddProduct;
            ProductsForm frm = new ProductsForm(this, "ADDNEW");

            frm.ShowDialog();
        }
 private void dgv_CellClick(object sender, DataGridViewCellEventArgs e)
 {
     if (subMenu == MenuItems.Products || subMenu == MenuItems.AddProduct)
     {
         ItemSelected = dgvProducts.CurrentCell.RowIndex;
         ProductsForm frm = new ProductsForm(this, null);
         frm.ShowDialog();
     }
     else if (subMenu == MenuItems.Orders || subMenu == MenuItems.AddOrder)
     {
         ItemSelected = dgvProducts.CurrentCell.RowIndex;
         OrdersForm ord = new OrdersForm(this, null);
         ord.ShowDialog();
     }
 }