Develop Office Client Applications using Visual Studio
This episode has a tip about adding controls to Word documents, a case file about how Canada Post solved its data entry problems, and what to do when an add-in doesn't run and there's no error message.
Related resources for more information:
Problem adding a label to a Word document
Why did this add-in stop running?
Canada Post case study
What if my "COM Add-in" button is greyed out?
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Why is it so hard to find info on VSTO? The link is less than 4 years old and it's already broken!