I see that you've also posted this to the support case we've opened for you.  For the moment, until we find out more, it'll be more efficient for both you and us to handle this issue through the support case.

Thanks for your understanding.

Hi,

Similar problem, but with different logic.

Instead of DataTable, I am now using BindingSource, and simpley assign it to Chart.Data.

.components);

._bindingSource;

And everytime I plot a new chart, I simply update _bindingSource.DataSource.

However, it's very weird that the below exception happens randomly, and also on random machine. And the below exception simply creates the usual RED X on Chart.

Unhandled Thread Exception, Exception

='System.NullReferenceException: Object reference not set to an instance of an object. at Infragistics.UltraChart.Data.IListToChartAdapter2.GetStringValue(Int32 row, Int32 column) at Infragistics.UltraChart.Core.Layers.ScatterLayer.CreateSeriesHashtable(ScatterChartAppearance scatterApp) at Infragistics.UltraChart.Core.Layers.ScatterLayer.FillSceneGraph(SceneGraph scene) at Infragistics.UltraChart.Core.ChartCore.DrawChart() at Infragistics.Win.UltraWinChart.UltraChart.OnPaint(PaintEventArgs e) at System.Windows.Forms.Control.PaintWithErrorHandling(PaintEventArgs e, Int16 layer, Boolean disposeEventArgs) at System.Windows.Forms.Control.WmPaint(Message& m) at System.Windows.Forms.Control.WndProc(Message& m) at System.Windows.Forms.ScrollableControl.WndProc(Message& m) at System.Windows.Forms.ContainerControl.WndProc(Message& m) at System.Windows.Forms.UserControl.WndProc(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m) at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)' (Loader.Unhandled Thread Exception)

tboy79,

I've discussed this issue with Max, and we believe that it will take further in-depth research to determine what is happening in your situation.  By creating a support case, we'll be able to give your issue the personal attention that it requires.

I've passed this information to Developer Support to create a case for you.  You'll receive notification of the creation of this case in a separate email message.

Thanks for your understanding.

First, this symptom happens randomly, but was able to reproduce all the time. And, I am plotting an average of 10,000 points per each plot.

Then, Just found very good example while debugging. I believe that this should really explain why the exception happens.

On the thread that was populating the data table, I got the following call stack. (latest on top, and beginning on bottom)

And _chart.DataSource is null, and did not even called DataBind. Refer below call stack.

Correct me if I am wrong, but the whole _chart.ResetDataSource does not seem to work properly, as the below stack indicates that the chart is still listening to events that happens on its data source, which is data table in my case.

System.Windows.Forms.dll!System.Windows.Forms.Control.Invalidate() + 0x7 bytes

Infragistics2.Win.UltraWinChart.v8.2.dll!Infragistics.UltraChart.Resources.Appearance.DataAppearance.OnDataTableRowChanged(object sender = {System.Data.DataTable}, System.Data.DataRowChangeEventArgs args = {System.Data.DataRowChangeEventArgs}) + 0x1c bytes

Infragistics2.Win.UltraWinChart.v8.2.dll!Infragistics.UltraChart.Resources.Appearance.ChartAppearance.UpdateAll(bool resize = false, bool invalidate = true) + 0x4f bytes

Infragistics2.Win.UltraWinChart.v8.2.dll!Infragistics.UltraChart.Resources.Appearance.DataAppearance.DataBind() + 0x3c bytes

Infragistics2.Win.UltraWinChart.v8.2.dll!Infragistics.UltraChart.Resources.Appearance.DataAppearance.OnDataTableRowChanged(object sender = {System.Data.DataTable}, System.Data.DataRowChangeEventArgs args = {System.Data.DataRowChangeEventArgs}) + 0x1c bytes

...

System.Data.dll!System.Data.DataRowCollection.Add(object[] values) + 0x30 bytes

IED.STLA.dll!MorganStanley.IED.STLA.UI.Graphs.ChartControl.PopulateDataInTable() Line 664 + 0x18d bytes

1) which one is recommended between _chart.ResetData() or _chart.ResetDataSource to clear data between plotting different graphs?

2) I am currently using 8.2.2, and I believe that my firm has license for 8.2.3 and also 9.1. Is there any fix for UltraChart component in those two later fixes that may be useful for me?

3) Even there is a chance that multiple thread is trying to access the DataTable, I always lock the DataTable before populating it. So, no harm there. And also verified that the populate method is on a single thread.

And, the below exception is called exactly at the below line of code:

_chartDataTable.Rows.Add(

new object[] { factorData.FactorName + key, scaledTime, factorData.y.Value + _newYValues[key - 1] });

However, _chart's Data is not assigned to this table. Why the below
"Infragistics.UltraChart.Render.ChartRender" involved here?

Exception:

System.InvalidOperationException: Collection was modified; enumeration operation may not execute.
   at System.Collections.ArrayList.ArrayListEnumeratorSimple.Reset()
   at Infragistics.UltraChart.Render.ChartRender.RenderSceneGraph(SceneGraph scene, Graphics g, Boolean chartDrawItem)
   at Infragistics.UltraChart.Render.ChartRender.RenderSceneGraph(SceneGraph scene, Graphics g)
   at Infragistics.Win.UltraWinChart.UltraChart.OnPaint(PaintEventArgs e)
   at System.Windows.Forms.Control.PaintWithErrorHandling(PaintEventArgs e, Int16 layer, Boolean disposeEventArgs)
   at System.Windows.Forms.Control.WmPaint(Message& m)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
   at System.Windows.Forms.ContainerControl.WndProc(Message& m)
   at System.Windows.Forms.UserControl.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)