public interface ITest
    {
        void Search();
    }
    public class Test : ITest
    {
        public void Search()
        {
            throw new NotImplementedException();
        }
    }
 static void Main(string[] args)
        {
            var t = Type.GetType("ConsoleApplication1.Test");
            var test = Activator.CreateInstance(t) as ITest;
            test.Search();

            Console.ReadLine();
        }