How to find all the classes which implement a given interface?

Question

Under a given namespace, I have a set of classes which implement an interface. Let\'s call it ISomething. I have another class (let\'s call it CClass

Answer 1

foreach (Type t in Assembly.GetCallingAssembly().GetTypes())
{
    if (t.GetInterface("ITheInterface") != null)
    {
        ITheInterface executor = Activator.CreateInstance(t) as ITheInterface;
        executor.PerformSomething();
    }
}