.net - Get Properties From Anonymous Type In VB.NET?

I am trying to figure out how to get at an anonymous typed object's properties, when that anonymous type isn't created in the current function.

Specifically, I am binding an ASP.NET ListView to LINQ resultset, then trying to process each item in the ItemDataBound event.

Option Explicit On
Option Strict On
Class MyPageClass
Private Sub Bind()
Dim items As ItemData = FetchItemData()
Dim groups = From s In items Group s By Key = s.GroupId Into Group _
Select GroupID = Key, GroupData = Group
' This works fine:
Dim groupId As Integer = groups(0).GroupID
lvGroups.DataSource = groups
lvGroups.DataBind()
End Sub
Private Sub lvGroups_ItemDataBound(ByVal sender As Object, ByVal e As ListViewItemEventArgs) Handles lvGroups.ItemDataBound
If e.Item.ItemType = ListViewItemType.DataItem Then
Dim item As ListViewDataItem = DirectCast(e.Item, ListViewDataItem)
Dim groupData = item.DataItem ' This is the anonymous type {GroupId, GroupData}
' Next Line Doesn't Work
' Error: Option Strict disallows late binding
Dim groupId As Integer = groupData.GroupId
End If
End Sub
End Class

What do I need to do in lvGroups_ItemDataBound() to get at the item.DataItem.GroupId?