How to Change the RadChart's Item Soucre while update RadChart

[kakit]

How can I  Change the RadChart's Item Soucre while update RadChart,

private void UpdateBarChart(RadChart chart, string region, ObservableCollection<StoreAnalysis> storeAnalysisList)
        {
            chart.DefaultView.ChartTitle.Content = "Region Performance - Region Comparsion";
            chart.SeriesMappings.Clear();
            chart.ItemsSource = storeAnalysisList;
            chart.SeriesMappings = new SeriesMappingCollection();
           
            SeriesMappingCollection seriesMapping = new SeriesMappingCollection();
            ChartAggregateFunction aggFunct = ChartAggregateFunction.Sum;
            SeriesMapping seriesMap = new SeriesMapping();
            seriesMap.GroupingSettings.GroupDescriptors.Add(new ChartGroupDescriptor("Period"));
            seriesMap.GroupingSettings.GroupDescriptors.Add(new ChartGroupDescriptor("StoreName"));
            seriesMap.ItemMappings.Add(new ItemMapping("Sales", DataPointMember.YValue, aggFunct));
            seriesMap.ItemMappings.Add(new ItemMapping("StoreName", DataPointMember.XCategory));
            chart.SeriesMappings.Add(seriesMap);

            chart.DefaultView.ChartArea.StartTransitionAnimation();
            chart.Rebind();
        }

it will cause error from this code when run "chart.SeriesMappings.Add(seriesMap);"
am i miss something?

[Evgeni "Zammy" Petrov]

Hello kakit,

 First you should not create new SeriesMappingCollection, clearing is it more than enough.
There is no need to call Rebind if you have databound RadChart to an ObservableCollection.

This is all I can infer from the source code you have sent 

If you still have this problem please provide us with additional details about the specific scenario.

Kind regards,
Evgeni "Zammy" Petrov
the Telerik team