Linq to XML 'Where not in' syntax problem

Dim BasicGroups As String() = New String() {"Node1", "Node2"}
Dim NodesToRemove = From Element In SchemaDoc.Root.<Group> _
                    Where Element.@Name not in BasicGroups
For Each XNode In NodesToRemove
    XNode.Remove()
Next

where (not (list.Contains(foo))

Dim SchemaDoc As New XDocument(<Root><Group Name="Foo"/><Group Name="Node1"/>
                           <Group Name="Node2"/><Group name="Bar"/></Root>)
Dim NodesToRemove = From Element In SchemaDoc.<Root>.<Group> Where _
                           Element.@Name Like "NotNode?"
For Each XNode In NodesToRemove.ToArray()
  XNode.Remove()
Next

Dim NodesToRemove As New Collections.ObjectModel.Collection(Of XNode)
For Each Element In SchemaDoc.<Root>.<Group>
  If Not BasicGroups.Contains(Element.@Name) Then
    NodesToRemove.Add(Element)
  End If
Next

Dim NodesToRemove = From Element In SchemaDoc.Root.<Group> _
                    Where Not BasicGroups.Contains(Element.@Name)