I want to show my window on top of the TaskBar\'s clock when the windows starts.
TaskBar
How can I find the bottom right corner location of my desktop?
To access the desktop rectangle, you could use the Screen class - Screen.PrimaryScreen.WorkingArea property is the rectangle of your desktop.
Screen.PrimaryScreen.WorkingArea
Your WPF window has Top and Left properties as well as Width and Height, so you could set those properties relative to the desktop location.
Top
Left
Width
Height