I got a window that is 25px in height, and want it to dock to the screen bottom (so the height is 25px, and the width is 100%), it's because I'm making a RSS newsticker, and want it to slide at the bottom of the screen.
Since the code I gave you uses the Height of the object, you need to set the height before executing that line.
this.Height = 22; //this done first
this.Width = Screen.PrimaryScreen.Bounds.Width; //moved here to keep height and width in the same code locations
this.Location = new Point(0, Screen.PrimaryScreen.WorkingArea.Height - this.Height);