I have a web form which inherits a master page with various content placeholders. The problem I have is if I put default content in the master page then this content is being displayed even when I override it in a content page.

 Master Page (excerpt):

 <asp:ContentPlaceHolder ID="rightImages" runat="server">
	<img src="<%=ResolveClientUrl("~/images/image_top1.jpg")%>" alt="Front room interior" class="imageblock" />
	<img src="<%=ResolveClientUrl("~/images/image_mid1.jpg")%>" alt="Lifestyle shot" class="imageblock" />
	<img src="<%=ResolveClientUrl("~/images/image_btm1.jpg")%>" alt="Exterior of a house" class="imageblock" />
</asp:ContentPlaceHolder> 				    

 Web form:

<asp:Content ID="Content7" ContentPlaceHolderID="rightImages" Runat="Server">
        <img src="<%=ResolveClientUrl("~/images/image_top2.jpg")%>" alt="Front room interior" class="imageblock" />
        <img src="<%=ResolveClientUrl("~/images/image_mid2.jpg")%>" alt="Lifestyle shot" class="imageblock" />
        <img src="<%=ResolveClientUrl("~/images/image_btm2.jpg")%>" alt="Exterior of a house" class="imageblock" />
</asp:Content>

The only way to see the images in the web form is to comment out the default content in the master page. I must be doing something badly wrong because I couldn't find anyone else on Google who has reported the same problem.

Can anyone please help?

TIA Luke 

<asp:Image ID="Image1" runat="server" ImageUrl="~/images/image_top1.jpg" AlternateText="Front room interior" />

 It works ...

In case, you find it fixed, mark it as fixed.

Hi,

"~" represents the root directory of the application, is the absolute path,  is only used for the server control.

But the img control that you used in the application is a html control. So if you want to use the "~" in the path, you should add "runat=server" property, or you use the related path(for example: ../../).

Hope it helps.

We never add for ResolveClientUrl ... runat=server for other controls. Why only for IMG?

You can test the same code with using DIV, it shows perfectly. But not for IMG tag? Even with your approach also .. by adding runat=server also to IMG ... it doesn't work weird problem ... 

Question (rephrased):
   When DIV tag + ResolveClientURL is used in Master Page and derived page has overriden content, the content is overriden.
   But if you do the same with IMG tag + ResolveClientURL, the default content is not overriden.