In Banner.ascx we have two HTML elements, each inside an ASP panel:

<a href="http://p2p.wrox.com" target="_blank" runat="server" id="lnkVertical">

<a href="http://p2p.wrox.com" target="_blank" runat="server" id="lnkHorizontal">.

In Banner.ascx.cs we use the variables lnkVertical.HRef and lnkHorizontal.HRef to refer to the embedded URLs.

If I didn't have this example from the book, where could I find out that the "href" attribute of an HTML anchor has to be described as "HRef" in C#? Is there some standard reference work for such things?

You generally shouldn't need to modify standard HTML tags/elements with the "runat='server'" attribute. For most there is a suitable server control alternative. Particularly in this case you should use the "asp:hyperlink" control instead of a modified "a" tag. However, you can modify practically every HTML tag as you have done to make it visible on the server. When you do this the control will be one found in the System.Web.UI.HtmlControls namespace. In this case your "<a ... runat='server'..." will become an HtmlAnchor control. Look here for the members list, in which you'll find the HRef property.

-Peter
compiledthoughts.com

Thank you, Peter, for the helpful explanation.