Showing a hidden WPF window

Question

In a WPF window I want to hide it, show another window using ShowDialog then unhide the first window.

---

When I do that:

this.Hide();
var window2 = new Window2();
window2.ShowDialog();
this.Show();

The first window open as a blank and empty window.

What's wrong in this technique?

---

When I do that:

var window2 = new Window2();
Visibility = Visibility.Collapsed;
window2.ShowDialog();
Visibility = Visibility.Visible;

The first window exits then the application.

What's wrong in this technique too?

Answer 1

Do this instead:

this.Visibility = Visibility.Collapsed;    
...    
this.Visibility = Visibility.Visible;

Also, I saw your comment above that this doesn't work. However, I started a new WPF project, did this, built and ran it. It works.

Note that there are no errors.