protected void GridView2_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
mShoppingBag = (ShoppingBag)Session["mShoppingBag"];
ProductInBag product = new ProductInBag();
GridViewRow row = GridView2.Rows[e.RowIndex];
product.ProdID = int.Parse(row.Cells[0].Text);
product.Quantity = short.Parse(((TextBox)row.Cells[2].Controls[0]).Text);
mShoppingBag.UpdateProduct(product);
Session["mShoppingBag"] = mShoppingBag;
GridView2.EditIndex = -1;
populate_GridView2();
}