New Post: Speed up DataGridControl checking /binding Suggestion ?

i am using extended datagridcontrol. Binding the datagrid by using datagrid.itemsource. I have checkbox and grouping in side the datagrid.While checking in group item, i have to automatically check all other items in that group. for that i used datagrid_currentCellChanged event.
but its taking too much time to check all items . Is there any alternative method for the same ?

here its my code

Private Sub dgItem_CurrentCellChanged(sender As Object, e As EventArgs) Handles dgItem.CurrentCellChanged


Try

    Me.itemClsPackingSectionNotification = New clsPackingSectionNotification
    Me.itemClsPackingSectionNotification = Me.dgItem.CurrentItem
    Dim strRecName As String = Me.itemClsPackingSectionNotification.Recipients.Trim
    Dim bolSel As Boolean = Me.itemClsPackingSectionNotification.Sel
    Me.listClsPackingSectionNotification = Me.dgItem.ItemsSource

    Dim objSet As New List(Of clsPackingSectionNotification)
    objSet = (listClsPackingSectionNotification.FindAll(Function(x) x.Recipients = strRecName))

    For Each itm As clsPackingSectionNotification In objSet
        If itm.Recipients = strRecName Then
            If itm.Sel = True Then
                itm.Sel = False
                Me.itemClsPackingSectionNotification.Sel = False
            Else
                itm.Sel = True
                Me.itemClsPackingSectionNotification.Sel = True
            End If
        End If
    Next
    dgItem.UpdateLayout()
    dgItem.Items.Refresh()

Catch ex As Exception
    Dim MyError As New ErrorLog
    MyError.WriteToErrorLog(ex.Message, ex.StackTrace)
End Try

End Sub




i have one more doubt

while checking the checkbox in datagrid,its not change its status by single click.

what can i do for both my the problem?