VSTO Tip - Show Errors from your Add-In
By default, Microsoft have chosen to hide user interface errors for Office add-ins. That means whenever an unhandled exception occurs, you are none the wiser if you’re not debugging. There are two solutions to this: Implement an exception handler (like LadyLog ) Show the errors by changing the end user options
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Read the complete post at http://ericphan.info/blog/2010/11/22/vsto-tip-show-errors-from-your-add-in.html