Aah, great! That worked. Thank you for your help!

That's correct.  Application.Run() adds a handler for the passed-in form's  
Closed event, in which it calls ExitThread().
http://msdn2.microsoft.com/en-us/library/ms157902(VS.80).aspx

However, hiding the form is only an appropriate solution if you're keeping  
a reference to that form and intend to show it again later.  If the form  
is intended to remain closed, then you really should be closing it  
(allowing it to be disposed).

In this case, yes the Main() method in the Program class will need to be  
modified, so that it just calls Run() without passing a form (showing the  
initial form first, of course), and you'll need to add an explicit call to  
Application.ExitThread() where you really want the application to be shut  
down, but that's much better than being sloppy about resource management.

After you're done, it'll look something like this (leaving out the default  
stuff):

    static class Program
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            new Form1().Show();
            Application.Run();
        }
    }

    public partial class Form1 : Form
    {
        private void button1_Click(object sender, EventArgs e)
        {
            Form2 form2 = new Form2();

            form2.Show();
            Close();
        }
    }

    public partial class Form2 : Form
    {
        protected override void OnClosed(EventArgs e)
        {
            base.OnClosed(e);
            Application.ExitThread();
        }
    }

Don't be afraid to edit Program.cs to suit your needs.  It's generated by  
the project template, but it's not part of a designer or anything.  Once  
it's in your project, you can always modify it as appropriate.

Pete

On Feb 27, 12:25 pm, "Alberto Poblacion" <earthling-
quitaestoparacontes...@poblacion.org> wrote:

Thanks! That seems to be working, except that as soon as I click the
button, form2 opens and then immediately closes, ending the debugging
session. Do you know why? I added a button to form2 (trying to make it
go back to form1), but it doesn't wait for input from the user, it
just closes.