"Add to Cart" is not working and not showing up?

Question

In "PartsListBlock.ascx" I have got a row:
<asp:TemplateColumn HeaderText="www" Visible="True">
                        <ItemStyle HorizontalAlign="center"></ItemStyle>
                        <ItemTemplate >
                         <asp:HyperLink id="lnkAddToCart" runat="server" ImageUrl="~/assets/common/themes/balticpolo/addtocart.gif"
                                NavigateUrl="../../commerce/cart.aspx?AddPartNo=" visible="True">In den Einkaufskorb.</asp:HyperLink>
                        </ItemTemplate>
                    </asp:TemplateColumn>
But this row is not visible.
I need to provide the opportunity to add an item right from PartList Block to the shopping cart..
Any idea ?
[Edit you can see the shop here: <a href="http://195.226.73.238/catalog/partlist.aspx?CategoryID=9&serverid=balticpolo">clicky</a>
Message was edited by:
        Bjoern Kaiser

Answer 1

Thanks Stephen,
I got one step further =)
Now there is at least an output from the codeblock.
But:
<asp:HyperLink id="lnkAddToCart" runat="server" ImageUrl="../../assets/common/icons/addtocart.gif"
                                NavigateUrl="../../commerce/cart.aspx?AddPartNo=">Add To Cart.</asp:HyperLink>
shows the "Search" Button, which leads to the detail site.
But I didnt declared it nor wanted it to pop up there (http://195.226.73.238/catalog/partlist.aspx?CategoryID=9&serverid=balticpolo)
I use the original partlistblock, only with changes in style and order.
Is the order important ?!
I tried to make the code readable:
<asp:TemplateColumn>
                        <ItemStyle VerticalAlign="top" CssClass="catDetail" ></ItemStyle>
                        <ItemTemplate >
                             <h2 class="catDetailPartName">
                                <asp:Literal id=ltlPartName runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.PartName") %>'>
                                </asp:Literal>
                            </h2>
                             <p >
                                <asp:Literal id=ltlPartDescription runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.Description") %>'>
                                </asp:Literal><br /><br />
                                Preis: <asp:Literal id="ltlPartPrice" runat="server" Text="N/A"></asp:Literal>
                            </p>
                            <asp:HyperLink  id="lnkImage" runat="server" NavigateUrl="../partdetail.aspx?partno=" Text='<%# DataBinder.Eval(Container, "DataItem.PartName") %>'>
                            </asp:HyperLink>
                            <br clear="all" />                           
                             <asp:HyperLink id="lnkAddToCart" runat="server" ImageUrl="../../assets/common/icons/addtocart.gif"
                                NavigateUrl="../../commerce/cart.aspx?AddPartNo=">Add To Cart.</asp:HyperLink>
                        </ItemTemplate>
                    </asp:TemplateColumn>
is this totally wrong ?