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what will be the cause of following exception.


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I am developing an application in whichI have used Datatable as datasource of Chart.

I have one worker thread in which there is timer.

I timer elapsed event , i am adding the rows to the datatable .\

for each iterartion of timer i am clearing the rows and adding new rows.

but i am getting one exception , stacktrace for which is shown below :


Object reference not set to an instance of an object.

at System.Data.DataView.GetRecord(Int32 recordIndex)

at System.Data.DataView.GetRow(Int32 index)

at System.Data.DataRowView.get_Row()

at System.Data.DataRowView.BeginEdit()

at System.Windows.Forms.CurrencyManager.OnCurrentChanged(EventArgs


at System.Windows.Forms.CurrencyManager.ChangeRecordState(Int32

newPosition, Boolean validating, Boolean endCurrentEdit, Boolean

firePositionChange, Boolean pullData)

at System.Windows.Forms.CurrencyManager.set_Position(Int32 value)

at ChartFX.WinForms.DataProviders.d.b()

at ChartFX.WinForms.DataSourceSettings.a(IDataEx A_0,

FieldMapCollection A_1, PropertyDescriptorCollection A_2, b A_3, Boolean A_4)

at ChartFX.WinForms.DataSourceSettings.a()

at ChartFX.WinForms.DataSourceSettings.e()

at ChartFX.WinForms.ap.d()

at ChartFX.WinForms.ap.k()

at ChartFX.WinForms.Chart.a(IGraphicsEx A_0, Boolean A_1)

at ChartFX.WinForms.Chart.OnPaint(PaintEventArgs e)


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)


System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)

at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message&


at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd,

Int32 msg, IntPtr wparam, IntPtr lparam)

at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG&




dwComponentID, Int32 reason, Int32 pvLoopData)


System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)


System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)

at System.Windows.Forms.Application.Run(Form mainForm)


I am not getting the cause of this exception ?

Can u please help me?

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