Private Sub HandleUpdate(ByVal row As GridViewRow, ByVal rowIndex As Integer, ByVal causesValidation As Boolean)
    If ((Not causesValidation OrElse (Me.Page Is Nothing)) OrElse Me.Page.IsValid) Then
        Dim data As DataSourceView = Nothing
        Dim isBoundUsingDataSourceID As Boolean = MyBase.IsBoundUsingDataSourceID
        If isBoundUsingDataSourceID Then
            data = Me.GetData
            If (data Is Nothing) Then
                Throw New HttpException(SR.GetString("GridView_DataSourceReturnedNullView", New Object() { Me.ID }))
            End If
        End If
        Dim e As New GridViewUpdateEventArgs(rowIndex)
        If isBoundUsingDataSourceID Then
            Dim entry As DictionaryEntry
            For Each entry In Me.BoundFieldValues
                e.OldValues.Add(entry.Key, entry.Value)
            Next
            If (Me.DataKeys.Count > rowIndex) Then
                Dim entry2 As DictionaryEntry
                For Each entry2 In Me.DataKeys.Item(rowIndex).Values
                    e.Keys.Add(entry2.Key, entry2.Value)
                Next
            End If
            If ((row Is Nothing) AndAlso (Me.Rows.Count > rowIndex)) Then
                row = Me.Rows.Item(rowIndex)
            End If
            If (Not row Is Nothing) Then
                Me.ExtractRowValues(e.NewValues, row, False, True)
            End If
        End If
        Me.OnRowUpdating(e)
        If (Not e.Cancel AndAlso isBoundUsingDataSourceID) Then
            Me._updateKeys = e.Keys
            Me._updateOldValues = e.OldValues
            Me._updateNewValues = e.NewValues
            data.Update(e.Keys, e.NewValues, e.OldValues, New DataSourceViewOperationCallback(AddressOf Me.HandleUpdateCallback))
        End If
    End If
End Sub