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Object reference not set to an instance of an object


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I'm developing windows based application to create and export a large number of charts to JPEG image stream and then write to database. I found after a few successful export, I will get the error message "Object reference not set to an instance of an object" when the code executed to the line of " SoftwareFX.ChartFX.Internet.Server.Chart thisChart=new SoftwareFX.ChartFX.Internet.Server.Chart();".

My sample code is below. My application in windows based, but I used SoftwareFX.ChartFX.Intenet.Server.Chart because I want to use the Export method to export JPEG image. I create the chart in memory.

But even though I called thisChart.Dispose() and thisChart==null. I still keep getting this error. Please help.


for (int i=0; i<100; i++)


using (SoftwareFX.ChartFX.Internet.Server.Chart thisChart=new SoftwareFX.ChartFX.Internet.Server.Chart())


  System.IO.MemoryStream ms=new System.IO.MemoryStream();

  thisChart.Export(SoftwareFX.ChartFX.Internet.Server.FileFormat.Jpeg, ms);






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