Start by adding a new reference to your project; System.Services.Web.

The SyndicationFeed class holds all the data about your feed and lets you spit everything out in a number of different formats (RSS2.0, ATOM1.0)- each item in the feed is held in a generic list of SyndicationItem objects. As I work for a publishers, I was creating an RSS feed of coming soon books so I added an extension method to my book class- ToSyndicationItem();

public static SyndicationItem ToSyndicationItem(this Book book)
{
    return new SyndicationItem(book.CoverTitle + " " + book.Subtitle, book.Description, new Uri(book.GetURL()))
    {
        Summary = new TextSyndicationContent(book.DescriptionShort, TextSyndicationContentKind.Plaintext),
        Id = book.Id.ToString(),
        LastUpdatedTime = book.InsertedDate
    };
}

This allows me to use all the standard select methods I already in my book class, to also populate my RSS feed. So to create the feed all I need do in my RSS.ashx handler file is;

List<Book> books = Book.GetBookPublishedBetween(DateTime.Now,DateTime.Now.AddDays( int.Parse( GroupConstants.ComingSoonMaxDays)));
List<SyndicationItem> syndicationItems = new List<SyndicationItem>();
foreach (Book book in books)
    syndicationItems.Add(book.ToSyndicationItem());

feed = new SyndicationFeed(syndicationItems)
{
    Title = new TextSyndicationContent("Coming Soon Titles"),
    Description = new TextSyndicationContent("Forthcoming publications."),
    BaseUri = new Uri(LinkHelper.GetBaseUrl())
};

var output = new StringWriter();
var writer = new XmlTextWriter(output);

new Rss20FeedFormatter(feed).WriteTo(writer);

context.Response.ContentType = "application/rss+xml";
context.Response.Write(output.ToString());

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<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
 <xsl:output method="html"></xsl:output>
    <xsl:template match="rss/channel/item">
    <li>
      <a href="{link}" title="{title}">
        <xsl:value-of select="title" />
      </a>
      <p>
        <xsl:value-of select="description" />
      </p>
    </li>
  </xsl:template>
</xsl:stylesheet>

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    <asp:ListView ID="RSSList" runat="server" DataSourceID="RSSData">
        <LayoutTemplate>
            <ul>
                <li id="itemPlaceholder" runat="server" />
            </ul>
        </LayoutTemplate>
        <ItemTemplate>
            <li><h2>
                <%#XPath("title") %>
            </h2>

            <%#XPath("author") %>
            <a href='<%#XPath("link") %>' title=''>View Original Post</a>
            </li>
        </ItemTemplate>
    </asp:ListView>
    <asp:XmlDataSource
        ID="RSSData"
        runat="server"
        DataFile="http://www.shawson.co.uk/codeblog/feed/"
        XPath="rss/channel/item">
    </asp:XmlDataSource>

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            StringBuilder sb_xml = new StringBuilder();
            XmlSerializer s = new XmlSerializer( typeof( Hachette.Checkout.Vista.Stock.ProductStockLiteResultResponse ) );
            StringWriter w = new StringWriter(sb_xml);
            s.Serialize(w, ws_response);
            w.Close();
            Response.Write("<!-- Response = " + sb_xml + " -->");

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