Statiuc

class Rectangle
{
    public static string ShapeName
    {
        get { return "Rectangle"; }

        private double length;
        private double width;

        public double Length
        {
            get
            {
                return length;
            }
            set
            {
                if ( value > 0.0)
                    length = value;
            }
        }

        public double Width
        {
            get
            {
                return width;
            }
            set
            {
                if (value > 0.0 )
                    width = value;
            }
        }

        public double GetArea()
        {
            return length * width;
        }
    }
}