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Editorial Team
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Asked: 2026-06-07T19:34:23+00:00

When I have a listview with like 46 items, where each item has 4

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When I have a listview with like 46 items, where each item has 4 subitems, the values of the subitems are changing with time, I use the values of subitems to draw a pie chart when an item in the list view is selected using this code:

Chart1.Series("Series1").ChartType = SeriesChartType.Pie
Chart1.Series("Series1").Points.Clear()

If ListView3.FocusedItem.SubItems(1).Text > 0 Then
    Chart1.Series("Series1").Points.AddY(ListView3.FocusedItem.SubItems(1).Text)
End If
If ListView3.FocusedItem.SubItems(2).Text > 0 Then
    Chart1.Series("Series1").Points.AddY(ListView3.FocusedItem.SubItems(2).Text)
End If
If ListView3.FocusedItem.SubItems(3).Text > 0 Then
    Chart1.Series("Series1").Points.AddY(ListView3.FocusedItem.SubItems(3).Text)
End If
If ListView3.FocusedItem.SubItems(4).Text > 0 Then
    Chart1.Series("Series1").Points.AddY(ListView3.FocusedItem.SubItems(4).Text)
End If

Is there a way to detect a change of a subitem’s value? Like onchange event in textbox, but for items or subitems, because I want the pie chart to update when a subitem value changes.
this code changes the sub items 

For xx As Integer = 0 To ListView3.Items.Count - 1
                If ListView3.Items(xx).SubItems(0).Text = googleXMLdocument...<s:name>(j).Value Then

                    If j + 1 = 1 Then
                        ListView3.Items(xx).SubItems(1).Text += 1

                    End If
                    If j + 1 = 2 Then
                        ListView3.Items(xx).SubItems(2).Text += 1
                    End If
                    If j + 1 = 3 Then
                        ListView3.Items(xx).SubItems(3).Text += 1
                    End If
                    If j + 1 > 4 Then
                        ListView3.Items(xx).SubItems(4).Text += 1
                    End If
                End If

            Next
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1 Answer

  1. Editorial Team

    Try this code. This way the chart will automatically get updated if there is any change in the subitems. You will not require a timer. 

    For xx As Integer = 0 To ListView3.Items.Count - 1
    If ListView3.Items(xx).SubItems(0).Text = googleXMLdocument...<s:name>(j).Value Then
        If j + 1 = 1 Then
            ListView3.Items(xx).SubItems(1).Text += 1
        End If
        If j + 1 = 2 Then
            ListView3.Items(xx).SubItems(2).Text += 1
        End If
        If j + 1 = 3 Then
            ListView3.Items(xx).SubItems(3).Text += 1
        End If
        If j + 1 > 4 Then
            ListView3.Items(xx).SubItems(4).Text += 1
        End If
    End If
Next

    Put the below code after the above code in a loop. You can also do away with the FocusedItem

    Chart1.Series("Series1").Points.Clear()

Chart1.Series("Series1").Points.AddY (ListView3.FocusedItem.SubItems(1).Text)
Chart1.Series("Series1").Points.AddY (ListView3.FocusedItem.SubItems(2).Text)
Chart1.Series("Series1").Points.AddY (ListView3.FocusedItem.SubItems(3).Text)
Chart1.Series("Series1").Points.AddY (ListView3.FocusedItem.SubItems(4).Text)
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