[RESOLVED] Howto reset a chart programatically

[Charlie20]

Hi all,

Hope someone can assist with this query :-

I've a chart control on a windows form & am using the following code to populate it :-

' Create a data series
Dim series1 As New Series()
Dim series2 As New Series()
Dim series3 As New Series()

' Add data points to the first series
            series1.Points.Add(L_Data_1)
            series2.Points.Add(L_Data_2)
            series3.Points.Add(L_Data_3)

' Add series to the chart
            Chart.Series.Add(series1)
            Chart.Series.Add(series2)
            Chart.Series.Add(series3)

' Charting the main results Graph
            Chart.Series(1)("DrawingStyle") = "Wedge"   
            Chart.Series(1).Color = Color.Green
            Chart.Series(1).Font = New Font("Microsoft Sans Serif", 12, FontStyle.Bold)
            Chart.Series(1).Label = L_Data_1

            Chart.Series(2)("DrawingStyle") = "Wedge"
            Chart.Series(2).Color = Color.Yellow
            Chart.Series(2).Font = New Font("Microsoft Sans Serif", 12, FontStyle.Bold)
            Chart.Series(2).Label = L_Data_3

            Chart.Series(3)("DrawingStyle") = "Wedge"   
            Chart.Series(3).Color = Color.Red
            Chart.Series(3).Font = New Font("Microsoft Sans Serif", 12, FontStyle.Bold)
            Chart.Series(3).Label = L_Data_3

The data to populate the chart is supplied by the user & then the above code is actioned from a button click event.

I am looking for the user to be able to change the data that is inputted & re-run the graph, so my question is - how do I create a new instance of the chart each time the button is clicked ?

Many thanks for any pointers.

Ciao

Charlie

[ForumAccount]

You don't need to create a new instance of the chart - you just need to clear the Points collection from the series and add the new data. You can then call ResetAutoValues to ensure the Axes are correctly labelled.

[Charlie20]

Thanks for the help it worked a charm.