C#: Close and Open two forms from a separate form -

i have 3 forms. how can make 1 form shown .show() , other hidden .hide() separate form?

this part of code

    private void buttonyes_click(object sender, eventargs e)     {         loggedin loggedinform = new loggedin();         loggedinform.hide(); // hides form in background         mainform mainform = new mainform();         mainform.show(); // show first form         this.hide(); // hides current form     } 

one problem, loggedin form not hide itself. looks of it skips , goes mainform.show();

is bug or need else?

the line loggedin loggedinform = new loggedin() going create new instance of login window. might useful if, say, intended show 5 "login" windows onscreen @ once. think want retrieve reference login window showing, , hide that; so, avoid creating new one.

properly passing references existing objects around program kind of structural problem, , 1 ran quite bit in programming days. quick, unclean, , not-recommended way declare instances of singular objects (like, maybe, login window) static, can retrieved anywhere. however, answer question in best way, maybe describe structure of program bit more (full code isn't necessary, generally-speaking, flow between classes)