what is difference between Window and page in WPF
What is UIVirtualization in WPF
The HttpGetEnabled property of ServiceMetadataBehavior is set to true and the HttpGetUrl property is a relative address, but there is no http base address. Either supply an http base address or set HttpGetUrl to an absolute address.
Closures in c# .NET
Get vs Post
Extension methods in c#
Page has to be hosted in a NavigationWindow or a Frame.
Windows are just normal WPF application Windows, and can host Pages in a Frame container.