WPF: Refer common namespace in app.xaml?

Question

Hi All,

I have lot of .CS files in one project which is referring to same namespace in all.(xmlns)

I have tried referring in app.xaml like

xmlns:test="clr-namespace:TestProject.test"

but Iam not able to access this "test" in all the files.

How can I just refer this common namespace at one place rather referring in each and every code file.

Thanks and Regards
rsc