c# load dll dynamic and run the method

           

  Assembly testDLL = Assembly.LoadFile(Directory.GetCurrentDirectory() +  @"\testDll.dll");

            Type type = testDLL.GetType("testDll.TestClass");
            object instanceOfMyType = Activator.CreateInstance(type);
            MethodInfo mi = type.GetMethod("fun1");
            mi.Invoke(instanceOfMyType, null);