订阅单独课程中的事件

I am having a bit of trouble subscribing to an event I have created. The event itself is in its own class and I want to be able to subscribe to it from a separate class in a separate project. I am able to subscribe to it from the class in which it is created - but when I try to subscribe from a different class in a different project nothing happens.I am having a bit of trouble subscribing to an