Hi Stephan,
Thank you for your interest in Syncfusion products.
is it possible to change the folder where the temporary png file will be createdYes. It is possible to save the temporary PNG file in different folder. The following code snippet is used to achieve this behavior :
ChartWebControl1.ImageUrlPath = "\\PNGImage";
Also I have created a simple sample for saving the PNG image in to different folder and it is available in the following link:
http://websamples.syncfusion.com/samples/Chart.Web/6.1.0.34/71094/main.htm Please try running the above sample and let me know if this helps.
Regards,
Vishnu