Change Startup Window

Question

I am using Visual Studio 2012 C#. I have created a WPF application project with a main window and added a login window to my project. I want to change the startup window to be my login window but can't seem to do so.

I went to the properties but all I see there is Myproject.app - should it not display the forms of my project?

Anyway I have tried running the window from code as well like so :

Application.Run(new Login()); 

But that does not seem to work. It gives an error saying :

Error 1 An object reference is required for the non-static field, method, or property 'System.Windows.Application.Run(System.Windows.Window)'

Answer 1

To change startup window update App.xaml by changing Application.StartupUri:

<Application ... StartupUri="MainWindow.xaml"> 

Answer 2

To change the startup window programmatically go to App.xaml remove the line StartupUri="MainWindow.xaml" (This will remove the default startup window configuration), now add the startup event Startup="Application_Startup", in App.xaml.cs

private void Application_Startup(object sender, StartupEventArgs e) {   If(somecase)    {      MainWindow mainWindow = new MainWindow ();      mainWindow.Show();    }   else    {      OtherWindow otherWindow= new OtherWindow();      otherWindow.Show();    } }