How to open a new window in Windows Forms in .NET?

To answer Rick's comment on Brian's answer:

        using (var login = new Login())
        {
            switch(login.ShowDialog())
            {
                case DialogResult.OK:
                    Application.Run(new Studio());
                break;
            }
        }

In Visual Studio, right-click on your project and select Add->Windows Form. That will give you a new form to work with. Lay it out how you want. Then you can launch the window from your main window with code similar to the following:

MyEditForm form = new MyEditForm();
form.Show();