how to move one window form to another window form

Question

hi
i hava login page form(Login),when i click on login button i want to move another form(Users) and i want to close Login form.
i wrote this code in button click
UsersForm obj = new userForm();
obj.show();
this.close();//Login page close
 once i call this.close() method both forms are closed ..
plz give me solution....