What does `(e, v) =>` syntactically mean in C#?

e.g., 

```
TreeViewModel root = TreeViewModel.initializeRoot(parentStatus, statuses);
root.PropertyChanged += (e, v) => updateConditions();

```

I know that I'm registering to listen to property changes of the root object. And, if such an event happens, then I'm calling the `updateConditions()` method. But, what is the `(e, v) =>` in between?

And, is there are way to send the changed property as a parameter to `updateConditions()`?