We have the add-in to excel written in C#. We are using Excel-DNA also. Lately we got this window on startup of Add-in
Any idea what is this window and how we can turn of it?
Answer from @Govert is helpful, but if you don't want to correct error and warnings in this window and not to see it you need to paste this part of code in your app.config file:
<!--Switch off the diagnostic -->
<system.diagnostics>
<sources>
<source name="ExcelDna.Integration" switchValue="Off"></source>
</sources>
</system.diagnostics>