c# - Pass variable from a form to other when closing -

i developing app requires close , open different winforms on time. faced problem, how can pass variable, in case serialport has been opened in initial form?

forms opened program.cs

application.run(new auth()); application.run(new main()); 

auth.cs code includes this:

serialport rcu = new serialport(); rcu.portname = textbox.text; //port name user input 

and want use port in other form "main".

is there possibility this?

thanks

just ask auth object in main constructor , initialize them in order:

auth auth = new auth(); main main = new main(auth); application.run(auth); application.run(main); 

then in main can save object , property once set:

public main(auth auth) {   authwindow = auth; }  public auth authwindow {get; set;}  // later.. authwindow.rcu 

note though, 2 application.run calls isn't way want go, create new auth form , show moment main form loaded.