How to select all row after click

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VB

controls

web

I have SIListView (WebControls)
That is have some rows and five cols. Now when submit click is available only the field of first columns, but i want select all rows.
What event i must use and how to select all row that was made click?

Now i found only event:

Private Sub ListNotifications_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ListNotifications.SelectedIndexChanged
Dim wCheck As Client..Notifications
ListNotifications.CheckedObjects(wCheck)

        End Sub

Need your hint urgently! Thank you