FormStartPosition.CenterParent does not work

Question

In the following code, only the second method works for me (.NET 4.0). FormStartPosition.CenterParent does not center the child form over its parent. Why?

Answer 1

Maybe this can help somebody.

Form frmMessage = new Form();

From experience, although they look similar, they behave different:

This variant doesn't work:

if (frmMessage.Parent != null)
    frmMessage.CenterToParent();
else
    frmMessage.CenterToScreen();

And this variant works

if (frmMessage.Parent != null)
    frmMessage.StartPosition = FormStartPosition.CenterParent;
else
    frmMessage.StartPosition = FormStartPosition.CenterScreen;