Login form in winform

Hi,

        I need to implement a login form in win form application.
 My scenario is :- Login form should open first--> with correct user name and password user should be able to login--> then another page should open and login page should get closed.

    Problem is:- Since log in page is the first page and it need to get put in Main()  function like below.

static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new login());
       
        }


After opening another form by formname.show() If I get exit from loginpage whole  application will get exit.

      Please how I can open another form without application exit and login form as my first form ?