C# Form.Close vs Form.Dispose

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This forum on MSDN tells you.

Form.Close() sends the proper Windows
messages to shut down the win32
window. During that process, if the
form was not shown modally, Dispose is
called on the form. Disposing the form
frees up the unmanaged resources that
the form is holding onto.

If you do a form1.Show() or
Application.Run(new Form1()), Dispose
will be called when Close() is called.

However, if you do form1.ShowDialog()
to show the form modally, the form
will not be disposed, and you’ll need
to call form1.Dispose() yourself. I
believe this is the only time you
should worry about disposing the form
yourself.

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