C# Circle set and get

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I have the working code, the set and get are supposed to not allow negative input. However, when this is run, negative input still returns results, what am I missing that is causing the negative values to still be calculated? Also, how would I introduce a function that allow the user to calculate for more than one circle?

   using System;
        using System.Collections.Generic;
        using System.Linq;
        using System.Text;

        namespace console
        {
            class Program
            {

                static void Main(string[] args)
                {

                    Console.Write("What is the circle’s radius: ");
                    double radius = Convert.ToDouble(Console.ReadLine());
                    Circle ans = new Circle(radius);


                    Console.WriteLine("The area of the circle is " + ans.getArea);
                    Console.WriteLine("The Diameter of the circle is " + ans.getDiameter);
                    Console.WriteLine("The Circumference of the circle is " + ans.getCircumference);

                    Console.Write("Enter any character to quit program. ");
                    double stop = Console.Read();

                }
            }
        }

That's the method and the class:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace console
{
    class Circle
    {

 public double radius;
            public const double PI = 3.14159;
            public Circle(double r)
            {
            radius = r;
        }
        public Circle()
        {
            radius = 0.0;
        }

        public double getDiameter
        {
            get
            {
                return radius * 2;
            }

        }


        public double getArea
        {
            get
            {
                return PI * radius * radius;
            }

        }
        public double getCircumference
        {
            get
            {
                return 2 * PI * radius;
            }

        }
        // property Radius 
        public double Radius
        {
            get
            {
                return radius;
            }

            set
            {
                // ensure non-negative radius value 
                if (value >= 0)
                    radius = value;
            }
        }
    }
}

asked 23 secs ago

user3429402

8