How to switch between windows without opening and closing WPF forms?

Question

WPF

There are 2 forms. By clicking on the button located on form1, there should be a switch to form2 without opening this form and closing form1, i.e. in the 1st form there is a switch between the contents of the 2 forms.
How to implement it?

Answer 1

Here I showed an example of what to do and how to do it:
How to navigate between pages in Windows Presentation Foundation?

Answer 2

if (window.WindowState == WindowState.Minimized)
    window.WindowState = WindowState.Normal;
window.Activate();

Try this if your forms are windows