Why don't I see the += operator overloaded on System.Delegate?

Question

I see the equality comparison operators == and != overloaded on System.Delegate and MulticastDelegate but not the +

Answer 1

When you declare a delegate as an event, it is actually an event wrapper around the delegate. See https://stackoverflow.com/a/4893006/397807 for the details. In short, you can only add a handler with += and remove with -= and compiler will help translate it to proper function call.