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Updating a listbox


Hey, I am adding buttons to select all or clear all in a listbox.  So far I have:

    Private Sub ButtonSelectAll_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ButtonSelectAll.Click

        For n As Integer = 0 To Me.ListBoxMonitors.Items.Count - 1
            Me.ListBoxMonitors.SetSelected(n, True)
        Next

    End Sub

This is fine except (a) there are many items, so it looks slow/ugly, and (b) it changes the scroll position.  Anybody have code that doesn't screw up the scroll position, and is there a function that allows me to suspsnd redrawing of the listbox until I've done everything I need to do?

Thanks in advance.
0
riceman0
Asked:
riceman0
1 Solution
 
Mike TomlinsonMiddle School Assistant TeacherCommented:
Something like...

    Private Sub ButtonSelectAll_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ButtonSelectAll.Click
        ListBoxMonitors.BeginUpdate()
        Dim prevTopIndex As Integer = ListBoxMonitors.TopIndex
        For n As Integer = 0 To Me.ListBoxMonitors.Items.Count - 1
            Me.ListBoxMonitors.SetSelected(n, True)
        Next
        ListBoxMonitors.TopIndex = prevTopIndex
        ListBoxMonitors.EndUpdate()
    End Sub
0

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