I need help, because I am just at a loss.  I'm not super comfortable
with XML, but I'm trying to fight my way through generating an RSS XML
file for Google Base, and I'm stuck with a Namespace issue.

How can I get XmlSerializer to generate the standard RSS tags with no
prefix, but ensure that the Google specific tags a prefixed with "g:"?

Here's a sample of the code I'm using, and it puts g: in front of ALL
the tags (rss, title, everything):

RSS.vb

Imports System.Xml.Serialization

' Taken from http://www.philweber.com/articles/easy_rss_in_vbnet.htm
Public Class rss
  <XmlElementAttribute("channel")> _
  Public channel As New rssChannel()
  <XmlAttributeAttribute("version")> _
  Public version As String = "2.0"
End Class

Public Class rssChannel
  Public title As String
  Public link As String
  Public description As String
  Public language As String = "en-us"
  <XmlElementAttribute("item")> _
  Public item As New rssChannelItems()
End Class

Public Class rssChannelItems
  Inherits CollectionBase

  Public Sub Add(ByVal Item As rssChannelItem)
    Dim I As Integer = List.Add(Item)
  End Sub

  Default Public ReadOnly Property Item(ByVal Index As Integer) As
rssChannelItem
    Get
      Return CType(List.Item(Index), rssChannelItem)
    End Get
  End Property
End Class

Public Class rssChannelItem
  ' Required
  Public id As String
  Public title As String
  Public description As String
  Public link As String
  Public price As Double

  ' Recommended
  Public provider_class As String
End Class

Export.vb

Sub GenerateGoogleBase()
    Dim rssFeed As rss = Nothing
    Dim rssItem As rssChannelItem

    Try
      rssFeed = New rss

      With rssFeed.channel
        .title = "one"
        .description = "two"
        .link = "three"
      End With

      rssItem = new rssChannelItem
      rssItem.id = "1234"
      rssFeed.channel.item.Add(rssItem)

      Dim xml As New XmlSerializer(GetType(rss), "http://
base.google.com/ns/1.0")
      Dim strFile As New FileStream("C:\Test.xml", FileMode.Create)

      Dim xmlns As New XmlSerializerNamespaces()
      xmlns.Add("g", "http://base.google.com/ns/1.0")

      xml.Serialize(strFile, rssFeed, xmlns)

    Catch ex As Exception
    End Try
End Sub

What am I missing?  I'm sure it's something simple, but I have
tinkered for hours now and I can't figure it out.

THANK YOU in advance for any light you can shed on this...

Generally if you want to ensure certain elements are in a certain
namespace then you do that by defining the Namespace =
"http://base.google.com/ns/1.0" in the XmlElementAttribute attribute e.g.

     <XmlElement(Namespace:="http://base.google.com/ns/1.0")> _
     Public price As Double

then make sure the root rss is in no namespace with e.g.

<XmlRoot(ElementName:="rss", Namespace:="")> _
Public Class rss

then I get (using the your remaining code unchanged)

<rss xmlns:g="http://base.google.com/ns/1.0" version="2.0">
   <channel>
     <title>one</title>
     <link>three</link>
     <description>two</description>
     <language>en-us</language>
     <item>
       <id>1234</id>
       <g:price>0</g:price>
     </item>
   </channel>
</rss>

--

I knew it would be something simple like this.

Ironically, I had tried something similar to this a few hours ago, but
I ended up with:

<price xmlns:="http://base.google.com/ns/1.0">0</price>

instead of

<g:price>0</g:price>

I had to play around with the code a bit, and I believe it was because
I had:

xmlns.Add(String.Empty, String.Empty)

instead of

xmlns.Add("g", "http://base.google.com/ns/1.0")

In any event, thank again!