I want to develop a desktop application based on WPF. How do I navigate via C# code from one page to another or from one page in a window?
Take a look at the following links below - these will give you a better understanding of navigating through a WPF application providing examples and sample apps.
How to Build, Manage and Navigate the User Interface of a WPF Application
A really easy way to navigate through an application I find is that if you add a Frame within a Window and then for your other corresponding pages, use Page and you need to do in the code behind of your window is as follows:
FrameContent.Navigate(new ExampleView());