Updating wpf parent window after some action on another window

Updating wpf parent window after some action on another window

i have one wpf window called usermanagement and there is a listbox showing
all the users, i have one button in usermanagement window called add user
and when i click on that new window opens called adduser, in this window
there are input fields to add new user, what i need when i save data and
this adduser window close then the usermanagement window update the
listbox, means users again update (the new added user should show there
after adding). at the moment i needed to open the usermanagement window
again to see the new added user. Thanks!