How to add item image information to rss news feed using ASP.NET

I'm trying to include an image in the rss feed xml I'm generateing using XmlTextWriter. I have two problems:

1. What is the correct output format for this information? I found one source that suggests it should be formatted as follows:

<item>...<media:content medium="image" url="http://www.somedomain.com/images/someimage.jpg"></media:content></item>

But other sources seem to suggest I should be using the enclosure element.

2. I tried to use the following code to generate my xml but when I look at it via the browser, I get "Reference to undeclared namespace prefix: 'media'."

Here's the code:
        Response.Clear()
        Response.ContentType = "text/xml"
        Dim xtwFeed As XmlTextWriter = New XmlTextWriter(Response.OutputStream, Encoding.UTF8)
        xtwFeed.WriteStartDocument()
        'The mandatory rss tag

        xtwFeed.WriteStartElement("rss")
        xtwFeed.WriteAttributeString("version", "2.0")

        'The channel tag contains RSS feed details
        xtwFeed.WriteStartElement("channel")
        xtwFeed.WriteElementString("title", "My News :: News")
        xtwFeed.WriteElementString("link", "http://www.mydomain.net/news.aspx")
        xtwFeed.WriteElementString("description", "The latest news from My domain.")
        xtwFeed.WriteElementString("copyright", "Copyright 2010 My Group. All rights reserved.")
        xtwFeed.WriteElementString("category", "News")
        xtwFeed.WriteElementString("ttl", "120")

        xtwFeed.WriteStartElement("image")
        xtwFeed.WriteElementString("url", "http://www.mydomain.net/images/logo.jpg")
        xtwFeed.WriteElementString("title", "The latest news from My Group.")
        xtwFeed.WriteElementString("link", "http://www.mydomain.net/")
        xtwFeed.WriteEndElement()

        Dim buildDate As Date = TimeZoneInfo.ConvertTimeToUtc(Now())
        xtwFeed.WriteElementString("lastBuildDate", buildDate.ToString("R"))
        For Each dr As DataRow In T.Rows
            xtwFeed.WriteStartElement("item")
            xtwFeed.WriteElementString("title", FormatForXML(dr.Item("nevTitle").ToString()))
            xtwFeed.WriteElementString("description", FormatForXML(dr.Item("nevDesc").ToString()))
            xtwFeed.WriteElementString("link", "http://www.mydomain.net/newsdetail.aspx?ID=" & dr.Item("nevID"))
            Dim d As Date = TimeZoneInfo.ConvertTimeToUtc(dr.Item("nevStartDate"))
            xtwFeed.WriteElementString("pubDate", d.ToString("R"))

            If Not DBNull.Value.Equals(dr.Item("nevPic1")) Then
               xtwFeed.WriteStartElement("media:content")
                xtwFeed.WriteAttributeString("medium", "image")
                xtwFeed.WriteAttributeString("url", dr.Item("nevPic1"))
                xtwFeed.WriteEndElement()
            End If

            xtwFeed.WriteEndElement()
        Next

        'Close all tags 
        xtwFeed.WriteEndElement()
        xtwFeed.WriteEndElement()
        xtwFeed.WriteEndDocument()
        xtwFeed.Flush()
        xtwFeed.Close()
        Response.End()

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This code writes the media:content as <media:content medium="image" url="/images/NewsEvents/Image01.jpg" />.

My goal is to use this feed as the input to DevExpress's ASPxNewsControl.

Thank you for any assistance you can provide.
LVL 1
ZekeLAAsked:
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ZekeLAAuthor Commented:
I found the problem. I needed to add the following code after the line with the 2.0 version attribute:

xtwFeed.WriteAttributeString("xmlns:media", "http://search.yahoo.com/mrss/")    ' note that media must be spelled as lowercase

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