The DebugInfo can be used to add data during the normal application lifecycle, but not when the ExceptionOccurred event is fired because at this point the DebugInfo is already generated. If you want to add information in the event handler, you can use the CustomData in the ExceptionOccurredEventArgs:
sender, ExceptionOccurredEventArgs e)
The data will be included at the end of the email as Value for the "[**Custom Data**]" key.
if you have other questions, don't hesitate to write us back.
All the best,
the Telerik team
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