By default the connection itself will handle the case where, while attempting to register the client's nick is already in use. It does this by simply appending 2 random numbers to the end of the nick.
True if the connection should handle this case and false if the client will handle it itself.
The NickError event is shows that the nick collision has happened and it is fixed by calling Sender's Register() method passing in the replacement nickname.
Connection Class | Sharkbite.Irc Namespace