Get the object of class at run time

namespace RuntimeObjectCreation
{
    using System;
    using System.Collections.Generic;
    class Program
    {
        public static IDictionary<string, string> Selector = new Dictionary<string, string>()
        {
            {"A","RuntimeObjectCreation.ClassA"},
            {"B","RuntimeObjectCreation.ClassB"},
            {"C","RuntimeObjectCreation.ClassC"}
        };

        static void Main(string[] args)
        {
            SelectionClass sc = new SelectionClass();
            var @object = sc.GetSelectedObject(Selector["A"]);

        }
    }

    public class SelectionClass
    {

        public object GetSelectedObject(string typeName)
        {
            return Activator.CreateInstance(null, typeName);
        }
    }

    public class ClassA
    {
        public string AName { get; set; }
    }

    public class ClassB
    {
        public string BName { get; set; }
    }

    public class ClassC
    {
        public string CName { get; set; }
    }
}