C # this. Hide ()

C # this. Hide ()

The first time you use it is in the _load function:
Booksystem bs = new Booksystem ();
Bs. ShowDialog ();
This. Hide ();

The second time when landing successful:  
Booksystem bs = new Booksystem ();  
                             bs.username = This.tbName.Text.Trim ();  
                              BS. Power = 1; 
                             BS. ShowDialog ();  
                             this. Hide ();    .
 

Booksystem bs = new Booksystem ();
This. Hide ();//hides the current window
Bs. ShowDialog (); Pop up a second window
This. Close ();//Closes the first window

To open a new window, the effect of closing the current window is the code above.

To close the entire program after you close the pop-up form
Booksystem bs = new Booksystem ();
Bs. ShowDialog (); Opens the Booksystem form as a modal dialog box, and then executes the statement below the code when the Booksystem form is closed.
Application.exit ();//exit the entire application.
Booksystem bs = new Booksystem ();
Bs. Show (); Pop-up window
Application.exit ();//Exit Program

C # this. Hide ()