Left[in] This parameter contains the coordinate of the left border of the rectangle.Top[in] This parameter contains the coordinate of the top border of the rectangle.Width[in] This parameter contains the width of the rectangle.Height[in] This parameter contains the height of the rectangle.
You can also use the SetRectangleFromLTRB method to set the location and size of the rectangle. It allows you to specify all the coordinates, and width and height of the resulting rectangle will be calculated internally.