How to add comments into a Xaml file in WPF?

I assume those XAML namespace declarations are in the parent tag of your control? You can’t put comments inside of another tag. Other than that, the syntax you’re using is correct.

<UserControl xmlns="...">
    <!-- Here's a valid comment. Notice it's outside the <UserControl> tag's braces -->
    [..snip..]
</UserControl>

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