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Gets the IRange object that represents the cell that lies under the lower-right corner of the object.
This property can be used to determine which worksheet cell is covered by the shape's lower-right corner.
IRange BottomRightCell { get; }
ReadOnly Property BottomRightCell As IRange
IShape shape = worksheet.Shapes.AddShape(AutoShapeType.Rectangle, 20, 20, 120, 60);
IRange range = shape.BottomRightCell;
string address = range.Address;