Here’s a convenient piece of code that you can use to get all classes that implement a given interface. Why do you need this? I assume that you have been programming against an interface rather than against a concrete implementation. Which is cool. Now since the interface is the common factor, here’s a way to get your objects of that type

var type = typeof(IMyInterface);

var types = AppDomain.CurrentDomain.GetAssemblies()

     .SelectMany(s => s.GetTypes())

     .Where(p => type.IsAssignableFrom(p));