Give me how to add a button btnAddToCart to BrowseProducts.aspx

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataKeyNames="ProductID" DataSourceID="SqlDataSource1">
        <Columns>
               <asp:ImageField DataImageUrlField="SmallImageUrl" > </asp:ImageField>    
               <asp:HyperLinkField HeaderText="Наименование товара"  DataTextField="Title" DataNavigateUrlFormatString="~/ShowProduct.aspx?ID={0}" DataNavigateUrlFields="ProductID" >
        </asp:HyperLinkField>
     ...
             <asp:TemplateField>
            <ItemTemplate>
            <asp:ImageButton ID="btnAddToCart" runat="server"ImageUrl="~/Images/ok.gif" ImageAlign="AbsMiddle" Onclick="btnAddToCart_Click" />
            </ItemTemplate>
            </asp:TemplateField>
        </Columns>
</asp:GridView>

Product product = Product.GetProductByID(_productID);

this.Profile.ShoppingCart.InsertItem(product.ID, product.Title, product.SKU, product.FinalUnitPrice);

this.Response.Redirect("ShoppingCart.aspx", false);

_PtoductID=?

 dont really get wut you looking for .....

there is already a button with that name on the page inside the grid

<asp:ImageButton ID="btnAddToCart" runat="server"ImageUrl="~/Images/ok.gif" ImageAlign="AbsMiddle" Onclick="btnAddToCart_Click" />

I do not know how to do that when you click   btnAddToCart the product is added to the Shopingcart