How to change StartupUri of WPF Application?

Question

I am trying to modify App.cs and load the WPF XAML files from code behind but its not working as it should.

No matter whatever I try to set as StartupUri it doesnt s

Answer 1

Akash, I ran into this exactly issue trying to implement a LoginDialog just like yours. The dialog does not have a bug, but rather the behavior is by design.

Not a bug. The default ShutdownMode of Application is OnLastWindowClosed, so as soon as the first window is closed your application will start shutting down! Change to OnExplicitShutdown and it will work, but you'll have to manage the shutdown.

See this previous StackOverflow question: WPF ShowDialog returns null immediately on second call