ASP.NET 4 Unleashed

Using Images and Hyperlinks in Master Pages

You must be careful when using relative URLs in a Master Page. For example, you must be careful when adding images and links to a Master Page. Relative URLs are interpreted in different ways, depending on whether they are used with HTML tags or ASP.NET controls.

If you use a relative URL with an ASP.NET control, the URL is interpreted relative to the Master Page. For example, suppose that you add the following ASP.NET Image control to a Master Page:

<asp:Image ImageUrl="Picture.gif" Runat="Server" />

The ImageUrl property contains a relative URL. If the Master Page is in a folder named MasterPages, the URL is interpreted like this:

/MasterPages/Picture.gif

Even if a content page is in a completely ...