WPF rounded corner textbox

Question

I don\'t know WPF and am now learning it. I was looking for rounded corners TextBox in WPF. So I searched Google and found a piece of XAML :

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Answer 1

@Smolla had a much better answer in his comment on @Daniel Casserly's answer:

If you want all the borders of TextBoxes and ListBoxes to have rounded corners, put the style into your Window's or App's .