How can I make a rounded-corners form in WPF?

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you need to set WindowStyle to WindowStyle.None, which will remove the chrome, then you can allow transparency which is an attribute int the Window element, and set the background color to transparent. All of this can be done as attributes to the window tag.

WindowStyle="None"
AllowsTransparency="True"
Background="Transparent"

To make the corners rounded, use a border and set the cornerRadius property

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