Generate RSS feed in Umbraco

@inherits Umbraco.Web.Mvc.UmbracoTemplatePage
@{
    Layout = null;
    Response.AddHeader("Content-Type", "text/xml");

    const string DATE_FORMAT = "ddd, dd MMM yyyy hh:mm:ss zzz";
    const string FEED_TITLE = "Dxred.com Blogs";
    string FEED_DESCRIPTION = Model.Content.Name + " - Code examples, tips and knowledge sharing";
    const string UPDATE_PERIOD = "hourly";
    const int UPDATE_FREQUENCY = 1;
    const string LANGUAGE = "en-US";
    const int CONTENT_PREVIEW_LENGTH = 500;

    IEnumerable<BlogPostPage> feedItems = Model.Content.Descendants<BlogPostPage>().Where(x => x.IsVisible()).OrderByDescending(x => x.UpdateDate);
    DateTime lastBuildDate = (feedItems != null && feedItems.Count() > 0) ? feedItems.Max(x => x.UpdateDate) : DateTime.Now;
    string feedUrl = ((IPublishedContent)CurrentPage).UrlWithDomain() + "rss";
}
<rss version="2.0"
     xmlns:content="http://purl.org/rss/1.0/modules/content/"
     xmlns:wfw="http://wellformedweb.org/CommentAPI/"
     xmlns:dc="http://purl.org/dc/elements/1.1/"
     xmlns:atom="http://www.w3.org/2005/Atom"
     xmlns:sy="http://purl.org/rss/1.0/modules/syndication/"
     xmlns:slash="http://purl.org/rss/1.0/modules/slash/">

    <channel>
        <title>@FEED_TITLE</title>
        <atom:link href="@feedUrl" rel="self" type="application/rss+xml" />
        <link>@Model.Content.UrlWithDomain()</link>
        <description>@FEED_DESCRIPTION</description>
        <lastBuildDate>@lastBuildDate.ToString(DATE_FORMAT)</lastBuildDate>
        <language>@LANGUAGE</language>
        <sy:updatePeriod>@UPDATE_PERIOD</sy:updatePeriod>
        <sy:updateFrequency>@UPDATE_FREQUENCY</sy:updateFrequency>
        
        <image>
            <url>@(SiteSettings.Instance.SiteHome.BlogLogo.Url())</url>
            <title>@FEED_TITLE | @FEED_DESCRIPTION</title>
            <link>@Model.Content.UrlWithDomain()</link>
            <width>139</width>
            <height>81</height>
        </image>

        @foreach (BlogPostPage item in feedItems)
        {
            string articleDescription = Umbraco.Truncate(item.Description, CONTENT_PREVIEW_LENGTH).ToString();
            @:<item>
                <title>@(item.Title ?? item.Name)</title>
                @:<link>
                    @umbraco.library.NiceUrlWithDomain(item.Id)
                @:</link>
                <comments>@umbraco.library.NiceUrlWithDomain(item.Id)#comments</comments>
                <pubDate>@(item.UpdateDate.ToString(DATE_FORMAT))</pubDate>
                <dc:creator><![CDATA[@item.CreatorName]]></dc:creator>
                <category><![CDATA[@item.Parent.Name]]></category>
                <guid isPermaLink="false">@item.UrlWithDomain()</guid>
                <description><![CDATA[@articleDescription]]></description>
                <content:encoded><![CDATA[@item.Content]]></content:encoded>
            @:</item>
        }
    </channel>
</rss>