How to declare a namespace in WPF XAML?

At the top of your XAML file, you need to declare what your "local" namespace is; alongside the default Microsoft XAML stuff. Something like this: xmlns:local="clr-namespace:YourApplication Note this assumes that "posintValidationRule" is defined at the root namespace in "YourApplication.

At the top of your XAML file, you need to declare what your "local" namespace is; alongside the default Microsoft XAML stuff. Something like this: xmlns:local="clr-namespace:YourApplication" Note this assumes that "posintValidationRule" is defined at the root namespace in "YourApplication".

Yes, it works, thanks! – rem Jan 18 '10 at 20:17.

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