I have a user requirement that I have been battling with for a while with no success. I need to write an add-in that can read around 100 formula-driven cells (of a specific spreadsheet) once every couple of minutes, and send to a web service.
I'm more than happy to use Excel-DNA or VSTO, but everything I've tried so far causes the user interface to hang for an instant. Would this always be the case if the data is being read from the active spreadsheet (even from a different thread) ?
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