Xml Serialization Problem

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VB

XML

serialization

Hi All,

Im having a problem serializing an xml document

My document is structured like this:

<recentActivity>
  <add>
    <file>
      <displayName>Logon.aspx</displayName>
      <ref>https://........</ref>
      <size>336</size>
      <lastModified>2012-05-25T04:40:57.000-07:00</lastModified>
      <mediaType>application/octet-stream</mediaType>
      <presentOnServer>true</presentOnServer>
      <fileData>https://..........</fileData>
    </file>
  </add>
  <edit>
    <file>
      <displayName>somefile.suo</displayName>
      <ref>https://...........</ref>
      <size>83968</size>
      <lastModified>2012-05-25T04:34:51.000-07:00</lastModified>
      <mediaType>application/octet-stream</mediaType>
      <presentOnServer>true</presentOnServer>
      <fileData>https://...........</fileData>
    </file>
  </edit>
</recentActivity>

As you can see, the "file" elements parent can be either "add" or "edit"

Here are my class objects

<XmlRoot("recentActivity")>
Public Class RecentActivities
    <XmlElement("edit"), XmlElement("add")> Public Property Items As ObjectModel.Collection(Of Activity)
End Class

Public Class Activity
    <"I need help here"> Public Property Action As String
    <XmlElement("file")> Public Property Details As FileDetails
End Class

In the code block above i need the "Action" property to be the name of the files parent element "add" or "edit"

How do i do it in one list? is it even possible?

i toyed with 2 lists, one for add and one for edit, but the output is in a specific order thats not always related to the lastmodified element of a file

Thanks in Advance