Constructor Problem

namespace NM1
{
    public class Rectangle
    {

        //variables
        private int length;
        private int breadth;

        //getters setters

        public int Length
        {
            get { return length; }
            set { length = value; }
        }
        public int Breadth
        {
            get { return breadth; }
            set { breadth = value; }
        }


        // WHEN THE CONSTRUCTOR IS DEFINED HERE THE ERROR ARISES IN THE INHERITED CLASS
        public Rectangle(int passedLength, int passedBreadth)
        {
            this.length = passedLength;
            this.breadth = passedBreadth;
        }

        public void rectangleArea()
        {
            Console.WriteLine("The area of the rectangle is : " + (Length * Breadth));
        }
    }

}
namespace NM2
{
    public class Square : NM1.Rectangle
    {

        public void calculateSquare()
        {
            Console.WriteLine("The length is inherited from rectangle : ---> " + this.Length);
            Console.WriteLine("The area of the sqaure is : " + (this.Length * this.Length));
        }

    }


    class programs
    {
        public static void Main()
        {
            Square s = new Square();
            s.Length = 12;
            s.Breadth = 14;
            s.calculateSquare();
            s.rectangleArea();
        }
    }

}