I've got a class that inherits from an interface. That interface defines an event that I'd like to subscribe to in the calling code. I've tried a couple of things, but they all resolve to false (where I know it's true). How can I check to see if a class implements a specific interface.

Here's what I've tried (note, the object in question is a usercontrol that implements MyInterface, stored in an array of controls, only some of which implement MyInterface - it is not null):

if (this.controls[index].GetType().IsSubclassOf(typeof(MyInterface)))
    ((MyInterface)this.controls[index]).Event += this.Handler;

if (this.controls[index].GetType().IsAssignableFrom(typeof(MyInterface)))
    ((MyInterface)this.controls[index]).Event += this.Handler;

if (this.controls[index].GetType() == typeof(MyInterface))
    ((MyInterface)this.controls[index]).Event += this.Handler;

All to no avail.