Refactor Switch Statements

using System;

namespace CodeKata
{
    public class Kata
    {
        private readonly Status _status;

        public Kata(Status status)
        {
            _status = status;
        }

        public Kata()
        {
        }

        public string GetStatusDescription()
        {
            if(_status == null)
            {
                return "I have never been set";
            }
            else {
                return _status.GetStatusDescription();
            }
        }
    }
        public abstract class Status
        {
            public abstract string GetStatusDescription();
        }

        public class NewStatus : Status
        {
            public override string GetStatusDescription()
            {
                return "I am new!";
            }
        }
        public class ActiveStatus : Status
        {
            public override string GetStatusDescription()
            {
                return "I am active";
            }
        }
        public class DeactivatedStatus : Status
        {
            public override string GetStatusDescription()
            {
                return "I have been deactivated";
            }
        }
    public class ExampleTestCases
    {
              static void Main(string[] args) {
            string status;
            status = new Kata().GetStatusDescription();
            Console.WriteLine(status);

            status = new Kata(new NewStatus()).GetStatusDescription();
            Console.WriteLine(status);

            status = new Kata(new ActiveStatus()).GetStatusDescription();
            Console.WriteLine(status);

            status = new Kata(new DeactivatedStatus()).GetStatusDescription();
            Console.WriteLine(status);

            Console.ReadKey();
        }
    }
}