Here’s a fun way to waste 2 hours of your life. I was writing a custom config section, and trying to figure out why this wasn’t throwing a duplicate key error:

<monitor name=“File” />
<monitor name=“File” />

After surfing Google endlessly, I finally found this on MSDN:
Note that elements with identical keys and values are not considered duplicates, and are accepted silently. Only elements with identical keys but different values are considered duplicates.

That was fun. :-/

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