LinqDataSource. Please, could someone help me out?

[shapper]

Hello,

I want to use a LINQ Data Source with a GridView and a FormView.
The problem is that I need to use custom LINQ Queries so I used the
following:

Private Sub ldsTags_Selecting(ByVal sender As Object, ByVal e As
LinqDataSourceSelectEventArgs) Handles ldsTags.Selecting
Dim db As New DBDataContext
Dim tags = From t In db.Tags _
Select t.TagID, _
t.Tag, _
IsUsed = t.FilesTags.Any Or t.PostsTags.Any
e.Result = tags
End Sub

Now I am trying to create the Update event:

Private Sub ldsTags_Updating(ByVal sender As Object, ByVal e As
LinqDataSourceUpdateEventArgs) Handles ldsTags.Updating

Dim db As New DBDataContext

End Sub

My question is:

How can I, inside my Updating event, get the ID and the values of the
record that is being updated, for example, in the FormView so I can
use the values in my custom LINQ Query?

Thank You,
Miguel