get href attrib of anchor element from code behind in asp.net

hi my dear friends :

how can i get href attrib of anchor element from code behind in asp.net? (c#)

why the below codes do n't work?

aspx :

            <a runat="server" id="lightbox" href='<%# GetImageurl() %>'>
            <asp:Image ID="imgInrpvEdit" r开发者_如何学Pythonunat="server" ImageUrl="~/Images/Admin/Unknown.png" />
            </a>

code behind :

protected string GetImageurl()
{
    return "/Images/Admin/Unknown.png";
}

note : my pages base on master & content pages + In those content pages i have multiview & upper Anchor is inside a view in content page...

best regards

You have to remove

runat="server"

and use this syntax

<%= GetImageurl() %>

If you can't remove runat="server" you can do it code-side:

protected void Page_Load(object sender, EventArgs e)
    {
        lightbox.Attributes.Add("href", GetImageurl());
    }

Update

If you want to use your actual syntax I think you have to call DataBind method:

protected void Page_Load(object sender, EventArgs e)
    {
        lightbox.DataBind();
    }

Maybe your tag is wrong?

try <%= GetImageurl() %>

http://naspinski.net/post/inline-aspnet-tags-sorting-them-all-out-%283c25242c-3c253d2c-3c252c-3c252c-etc%29.aspx

Somewhere in your page load sequence, you want to have:

lightbox.NavigateUrl = GetImageurl()); 

Also, you don't need to include an asp:Image, just do this right after the above:

lightbox.ImageUrl = "http://somewhere.jpg"