How to get current page URL in MVC 3

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I am using the Facebook comments plugin on a blog I am building. It has some FBXML tags that are interpreted by the facebook javascript that is referenced on the page.

This all works fine, but I have to pass in the current, fully-qualified URL to the plugin.

<div style="width: 900px; margin: auto;">
    <div id="fb-root"></div>
    <fb:comments href="https://stackoverflow.com/questions/5304782/URL HERE" num_posts="10" width="900"></fb:comments>
</div>

What is the best way to get the URL of the current page? The request URL.

Solution

Here is the final code of my solution:

<fb:comments href="https://stackoverflow.com/questions/5304782/@Request.Url.AbsoluteUri" num_posts="15" width="900"></fb:comments>

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