sevomin/Sevomin.News/views/Robots/Sitemap.cshtml

<?xml version="1.0" encoding="UTF-8" ?>

<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
    @foreach (Post post in Storage.GetAllPosts())
    {
        <url>
            <loc>@post.AbsoluteUrl</loc>
            <lastmod>@post.LastModified.ToString("yyyy-MM-ddThh:mmzzz")</lastmod>
        </url>
    }
</urlset>

@{
    Response.ContentType = "text/xml";
}