Question

I have a hyperlink in a usercontrol that I’d like to set visibility by using a declarative property, i.e.

<asp:HyperLink ImageUrl="/images/icons/rss.png" Visible="<%# ShowRssIcon %>" ID="FeedHyperLink" runat="server"></asp:HyperLink> 

However, it always remains visible, even if ShowRssIcon is false. ShowRssIcon is a simple property set on the usercontrol. Even setting ShowRssIcon to always return false results in the hyperlink showing.

However, setting Visible="false" or Visible="true" manually works as expected. Also, setting the property in the code behind on Page_Load event also works.

Any ideas? Thanks.

Answer 1

Since <%# expressions are evaluated at DataBind() time, if you used that, then you need to call DataBind(); method at PreRenderComplete like..

protected void Page_PreRenderComplete(object sender, EventArgs e)
{
    DataBind();
}