WPF xmlns: The 'clr-namespace' URI refers to a namespace that is not included in the assembly?

If Ping is the only namespace you're using, you should remove the reference to WPFDemo.

WPFDemo is another projext I'm referencing to (need to use a custom control in that project. ) Do they conflict? – Charlie Aug 20 at 6:39 Thanks for the clarification - so you are using multiple namespaces after all.

I would suggest that you post more code; there's nothing wrong with the XAML you've posted so far. It would be helpful to see the XAML that uses the local namespace and the declaration of the classes inside of Ping that you're using. – Paul Keister Aug 22 at 0:43.

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