multiple forms

Question

Hi guys, i had a question. i already had a c# form  but now i wanted to created a log on form to verify a user before he can access the second form.  i  placed the code below but still the intial form comes up first.

    

      if ((this.textBoxUsername.Text == "Admin") && (this.textBoxPassword.Text == "mbuyu"))

            {

                Form1 sortform = new Form1();

                sortform.Show();

                this.Hide();

            }

            else

                MessageBox.Show("You are not authorised to access this page", "Info");

        }

How do i make the new form come before the initial form.

Thanks in advance!