Appending data to a title tag using resouces file in asp.net PAGE tag

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C#

ASP.NET

I have page tag and i use the resource file to set the Title of the page when i use the code
<page title="<%$ Resources.Resource.PAGE_TITLE %>">

It is rendered correctly on the page.
But when i try to append words like this
<page title=" site_name <%$ Resources.Resource.PAGE_TITLE %>">

I get error and it is renedered as it is like this
site_name <%$ Resources.Resource.PAGE_TITLE %>


How can i append correctly to the title tag


Even for the link button if i use postback url withe <%$ Eval("item_id") %> it is rendered correctly .