c# - WPF: Close and open windows -

in case have main window , login view..

when main window closed, login window should displayed. close so:

    void closeoncompleteanddisplaylogin(object sender, runworkercompletedeventargs e)     {         this.close();         new login().show();     } 

in login window open mainwindow so:

            this.hide();             var window = new mainwindow(model).show(); 

problem: when login , open mainwindow first time works fine... when close mainwindow , login again, several functions of main window stop working or start throwing exceptions..

what doing wrong here? figured "window_loaded" events not triggered on re-login..

yes, loaded not triggered if hide/show. instead use shown event initialize logic.