make a form visible in a certain place

When you say "same location" please qualify it. Do you mean same location relative to the desktop or do you mean relative to the parent form?

If you need to show the form in the same location relative to the desktop but as a child of another form, then you could convert the desktop's position to a position in the parent form's client area. I am not sure what would happen if the coordinates were to be outside of the parent form; I assume you would get negative values that would cause a portion of the form to not show.

Okay, I did a bit of looking. Apparently a Form's Location Property is always in Screen coordinates. I will be surprised if that applies to child forms too but the documentation does not say that. Also look at the PointToClient and the PointToScreen methods.

Do you mean that you want to display form2 in the same absolute position on the desktop whether form1's maximized or not?

This will be impossible unless the starting position of form1 (when normal) is manually controlled because otherwise we won't know where Windows is going to put it.

The code I posted earlier will place form2 in the same relative position within form1 even if it's maximized but not, of course, in the same absolute position.

Sorry, George, I don't understand the question.

A maximized form is always going to cover the entire desktop apart from the TaskBar. 

Are you saying that you want a normal form to do the same thing or do you want it to be placed (with its normal size) in the top left hand corner of the desktop?

The code to do the latter would be:

thanks vulpes for the info.

There isn't any way to specify the location point of a maximized form to be the same in the case of a normal window form?

You can do:

child.StartPosition = FormStartPosition.Manual;
child.Location - new Point(0, 0); // place in top left hand corner of parent
// or
child.Location - new Point(100, 100); // place the left hand corner of child at co-ordinates (100,100) of parent