Question

If I use the following code without runat=”server” the input’s src works fine and I see the image coming through.

<div><input id="testButton" type="image" src="<%=TestButtonImageUrl %>" onserverclick="RedirectTest" /></div>

url is https://fpdbs.paypal.com/dynamicimageweb?cmd=_dynamic-image

But if I put the runat=”server” in, for some reason, I get this for the url:

<div><input id="testButton" type="image" src="<%=TestButtonImageUrl %>" onserverclick="RedirectTest" runat="server" /></div>

url is http://localhost/%3C%=lButtonImageUrl%20%%3E

Answer 1

You cannot use the <%= %> syntax with server controls (including standard HTML elements with runat="server"). You have two choices:

• Access the control in the code behind (as an HtmlInputControl) and assign the src attribute using the Attributes property: imageControl.Attributes["src"] = value;
• Assign the attribute using the databinding syntax (src="<%# %>") and call imageControl.DataBind() from the code behind