How to CenterParent a non-modal form

c# winforms forms parent-child centering
nawfal picture nawfal · Dec 19, 2011 · Viewed 19.6k times · Source

I have a non-modal child form which opens up from a parent form. I need to center the child form to its parent form. I have set property of child form to CenterParent and tried this:

Form2 f = new Form2();
f.Show(this);

but to no avail. This works with modal form, but not so with non-modal forms. Any simple solution, or need I go through all that mathematical calculation to fix its position to center?

Answer

Rotem picture Rotem · Dec 19, 2011

I'm afraid StartPosition.CenterParent is only good for modal dialogs (.ShowDialog).
You'll have to set the location manually as such:

Form f2 = new Form();
f2.StartPosition = FormStartPosition.Manual;
f2.Location = new Point(this.Location.X + (this.Width - f2.Width) / 2, this.Location.Y + (this.Height - f2.Height) / 2);
f2.Show(this);

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