A simple example of reflection. Getting the first class that implements a given interface and calling one of its methods.

Program.cs

using System;
using System.IO;
using System.Linq;
using System.Reflection;
using FindMe;

namespace TestProj
{
    class Program
    {
        static void Main(string[] args)
        {
            Assembly assem2 = Assembly.Load("FindMe");
            Type[] types = assem2.GetTypes();
            Type targetIface = typeof(IOperator);

            var implQuery =
                from type in types
                where (targetIface.IsAssignableFrom(type) && !type.IsAbstract && !type.IsInterface)
                select type;

            Type myType = implQuery.FirstOrDefault();

            IOperator instance = (IOperator)Activator.CreateInstance(myType);
            instance.Operate();
        }
    }
}