I want to use WCF RIA SERVICES in my WPF application.
but WCF RIA SERVICES client only surport silverlight and ASP.NET now, how can I use it in WPF application?
Here is the link describe the RIA servicive for WPF application http://blogs.msdn.com/b/davrous/archive/2010/12/03/how-to-open-a-wcf-ria-services-application-to-other-type-of-clients-the-soap-endpoint-3-5.aspx I think this is useful for you
You have to use RIA Services toolkit. It can be downloaded from here. After installing it, you can expose JSON, SOAP endpoints for your Domain Service. You can also use RIA Service with ASP.NET Dynamic data if you have the toolkit.