How to detect when a tile fails to load

We currently use SSRS to generate maps w/ custom layers and data.  The requests made by SSRS to the Bing Map system occasionally fail when creating PDF versions of the reports under heavy load.  I am looking for a way to work around SSRS's limitation
when using Bing Maps.
One approach I am exploring is to create a system that generates my own map images using the Bing Maps Api directly rather than being dependent upon SSRS.  However, i can imaging that at some point a request to Bing Maps will result in a failure.  Either
the system was unavailable or the request for the map tile timed out.  
I would like to be able to detect when a tile failed to be received.

Hi Z3M,
Thank you for your question.  
I am trying to involve someone more familiar with this topic for a further look at this issue. Sometime delay might be expected from the job transferring. Your patience is greatly appreciated.  
Thank you for your understanding and support. 
Thanks,
Simon Hou

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