[RESOLVED] by value and by ref question related to passing forms

[Muddy]

I dont understand something. If C# passes by value as the default then why does the text on the startup Form1 change when the following code is executed?

private Form1 frmMain;
public Form2(Form1 f)
{
InitializeComponent();
frmMain = f;
frmMain.Text = "Hello";
}

I would have thought that a new Form1 named f would be created and that the text change would occur on that new Form1 named f and not on the Form1 that was shown at startup. What am I misunderstanding? ... or are forms passed by reference? ...